Dose it take energy to create a magnetic field

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Author Topic: Dose it take energy to create a magnetic field (Read 14510 times)

TinMan	Dose it take energy to create a magnetic field « on: 2019-02-15, 08:19:35 »
Group: Elite Experimentalist Hero Member Posts: 4609	Decided to start this thread in relation to Luc's claim. First up,please know that i am not trying to prove anyone wrong here,but more so wanting to know if i am wrong. So as i do not mix up Luc's word's,i will copy and paste his exact statements here. Claim-->:Here is a video demo I made in December to demonstrate that the cost of power to create a magnetic field using an electromagnet is exactly the cost of wire resistance. This is not coincidence but an exact science.Please present your argument if you feel this is incorrect. So,dose it take energy/power to create a magnetic field ?,or is Luc correct when he says the magnetic field is created for free,and is backed by exact science?. Now,i know that it takes no energy to maintain a magnetic field,and the I/R losses add up to be equal to the power being delivered to the coil once peak current flow through the coil has been reached,but i am interested only in the creation of the magnetic field-as Luc has stated. I would be interested in hearing what others have to say. Brad Last edit to revise the title from the word ‘ power ‘ to the word ‘ energy ‘ as requested by Verpies. « Last Edit: 2023-11-10, 11:00:58 by Grumage » --------------------------- Never let your schooling get in the way of your education.

verpies	Re: Dose it take power to create a magnetic field « Reply #1 on: 2019-02-15, 11:44:36 »
Group: Professor Hero Member Posts: 3363	Yes, it takes no energy to maintain magnetic field (or current) in an ideal coil, but... It takes energy to create a magnetic field in an ideal coil and in such coil all of that magnetic energy can be recovered back (incidentally such recovery completely destroys this magnetic field). It takes energy to create a magnetic field in a resistive coil, but in such coil not all of that energy can be recovered back (because part of it is forever dissipated/lost as heat in the resistance). Generally, power is lower if the field creation rate is slower, even if the final energy is the same. The graph below represnts the current, energies and powers in any switched RL circuit: For the detailed analysis of this graph, visit this post. In a switched RL circuit, which is not subjected to external variable flux sources, the speed of the changes (effectively the circuit's time) is determined by the time constant Tau=L/R. 1) For charging coils in an RL circuit, the time on the horizontal axis runs forward, 2) For discharging coils in an RL circuit - the time on the horizontal axis runs backwards (except for E_R and E_TOT). 3) For zero resistance L circuits - the circuit's time stands still, the flux does not change ...and thus becomes frozen/constant. If there are no external sources of variable flux, then the current stays constant, too. P.S.^{The magnitude of the magnetic flux (Φ) is not shown on that graph above, but it can be calculated at any time by using the simple relationship Φ=I_LL} « Last Edit: 2023-11-16, 02:28:10 by verpies* »

TinMan	Re: Dose it take power to create a magnetic field « Reply #2 on: 2019-02-15, 11:49:18 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: verpies on 2019-02-15, 11:44:36 It takes energy to create a magnetic field in a resistive coil, but in such coil not all of that energy can be recovered back. Power is lower if the creation rate is slower, even if the final energy is the same. Thanks for your answer verpies. I removed the part about an ideal coil,as we will never be working with ideal coils. Anymore takers?. Brad --------------------------- Never let your schooling get in the way of your education.

F6FLT	Re: Dose it take power to create a magnetic field « Reply #3 on: 2019-02-15, 16:13:40 »
Group: Experimentalist Hero Member Posts: 1984	Quote from: TinMan on 2019-02-15, 11:49:18 ... I removed the part about an ideal coil,as we will never be working with ideal coils. ... Not sure... we are not far from superconductors at room temperature. --------------------------- "Open your mind, but not like a trash bin"

poynt99	Re: Dose it take power to create a magnetic field « Reply #4 on: 2019-02-15, 17:40:27 »
Group: Administrator Hero Member Posts: 3208 It's not as complicated as it may seem...	I think Luc's statement requires elaboration to make it more clear. Also, I would question that Luc is saying the field is created for free. --------------------------- "Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe." Frank Zappa

gotoluc	Re: Dose it take power to create a magnetic field « Reply #5 on: 2019-02-15, 21:31:59 »
Group: Elite Experimentalist Hero Member Posts: 901	Quote from: verpies on 2019-02-15, 11:44:36 It takes energy to create a magnetic field in an ideal coil, but in such coil all of that energy can be recovered back. Verpies reply is very close to what I'm saying, just in a different way. If the coil has no resistance then what ever power you put into it you can fully recover = no cost of power = Free magnetic field because in the end you got a magnetic field PLUS you recovered all the power. Does that not qualify for a free Magnetic field? Now that you created a free magnetic field, what will you do with it?... what ever work you get out of it, would that part not qualify as OU? (this will stir the pot) No more debates are needed, it's now confirmed a magnetic field is free and it's only wire resistance that keep us away from this reality, plus the limitations (maybe purposeful?) of our technology at this time that prevents us from using this great phenomenon. Who knows what else we'll discover once average experimenter like us have True super conductive wire to play with. Regards Luc

PhysicsProf	Re: Dose it take power to create a magnetic field « Reply #6 on: 2019-02-15, 22:51:32 »
Group: Professor Hero Member Posts: 2993	Luc: "it's now confirmed a magnetic field is free and it's only wire resistance that keep us away from this reality," Sorry, Luc, I have a hard time believing this. The B field stores energy, therefore one would say that energy should be required to produce it, beyond the wire resistance (loss). So how is it "it's now confirmed a magnetic field is free and it's only wire resistance that keep us away from this reality," How confirmed?

gotoluc	Re: Dose it take power to create a magnetic field « Reply #7 on: 2019-02-15, 23:15:04 »
Group: Elite Experimentalist Hero Member Posts: 901	Verpies confirmed it. Quote from: verpies on 2019-02-15, 11:44:36 It takes energy to create a magnetic field in an ideal coil, but in such coil all of that energy can be recovered back. So you put energy in, then you get it all back and end up with a magnetic field. Sounds like a free magnetic field to me? However, I don't think it would be free if the magnetic field instantly ended as you're taking the energy back. Of course that doesn't happen. If we take the energy back the same way we put the energy in then the magnetic field time is double. Regards Luc

TinMan	Re: Dose it take power to create a magnetic field « Reply #8 on: 2019-02-15, 23:23:07 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: PhysicsProf on 2019-02-15, 22:51:32 Luc: "it's now confirmed a magnetic field is free and it's only wire resistance that keep us away from this reality," Sorry, Luc, I have a hard time believing this. The B field stores energy, therefore one would say that energy should be required to produce it, beyond the wire resistance (loss). So how is it "it's now confirmed a magnetic field is free and it's only wire resistance that keep us away from this reality," How confirmed? Ah,that is the comment i was waiting for-->the B field stores energy. So,if it takes no energy to create the field,but the field will deliver energy when it collapses around the coil that created it,then we now have the !!creation!! of energy it's now confirmed a magnetic field is free Where is this confirmation ?. Brad. --------------------------- Never let your schooling get in the way of your education.

TinMan	Re: Dose it take power to create a magnetic field « Reply #9 on: 2019-02-15, 23:37:46 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: gotoluc on 2019-02-15, 21:31:59 , plus the limitations (maybe purposeful?) of our technology at this time that prevents us from using this great phenomenon. Who knows what else we'll discover once average experimenter like us have True super conductive wire to play with. Regards Luc Quote If the coil has no resistance then what ever power you put into it you can fully recover If the coil has no resistance,then it has no inductance. How is P/in calculated when R=0 ?. Quote Now that you created a free magnetic field, what will you do with it?... what ever work you get out of it, would that part not qualify as OU? (this will stir the pot) You cannot create a magnetic field while the inductor is in a super conductive state. Quote No more debates are needed, it's now confirmed a magnetic field is free and it's only wire resistance that keep us away from this reality I would like to see this confirmation Luc,as my tests i carried out last night clearly show that it takes energy to create the magnetic field. In saying that,there may be a way of doing what you are trying to achieve--i will give it some more thought Brad --------------------------- Never let your schooling get in the way of your education.

gotoluc	Re: Dose it take power to create a magnetic field « Reply #10 on: 2019-02-15, 23:53:00 »
Group: Elite Experimentalist Hero Member Posts: 901	Quote from: TinMan on 2019-02-15, 23:37:46 If the coil has no resistance,then it has no inductance. How is P/in calculated when R=0 ?. You cannot create a magnetic field while the inductor is in a super conductive state. Brad I guess you did not watch this video I posted on the first page of my topic. In this video they demonstrate what happens when you have current circulating in a Real super conductor. They demonstrate the Voltage falls to 0.000 So if the voltage is 0.000 how can there be any power dissipated across the coil? ... please explain where the power comes from. https://www.youtube.com/watch?v=PifnlZigp6c Cheers mate Luc

Reiyuki	Re: Dose it take power to create a magnetic field « Reply #11 on: 2019-02-15, 23:53:22 »
Group: Mad Scientist Full Member Posts: 185	Quote from: TinMan on 2019-02-15, 23:37:46 You cannot create a magnetic field while the inductor is in a super conductive state. I would like to see this confirmation Luc,as my tests i carried out last night clearly show that it takes energy to create the magnetic field. Brad I think he may mean 'how much NET energy does it take to create a magnetic field?' There is indeed a defined amount of energy required to establish the field, but the field collapse returns nearly all of this back into the system. A perfect inductor and perfect capacitor would exchange energy forever without losses. A nearly perfect inductor and capacitor will exchange energy with an extremely high Q factor. --------------------------- When you say something is impossible, you have made it impossible

TinMan	Re: Dose it take power to create a magnetic field « Reply #12 on: 2019-02-16, 00:45:29 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: gotoluc on 2019-02-15, 23:53:00 I guess you did not watch this video I posted on the first page of my topic. In this video they demonstrate what happens when you have current circulating in a Real super conductor. They demonstrate the Voltage falls to 0.000 https://www.youtube.com/watch?v=PifnlZigp6c Cheers mate Luc Yes,i watched the video Luc,but i dont think you paid attention to what they did in that video. What they showed was a complete waste of time and effort. They clearly state at 5:40 in the video-->to charge the device,we use a 20 amp 5v power supply. Once connected to the circuit,we then submerge the device in liquid nitrogen. So,it is exactly as i said it is. First the coil has to be energised,and then you submerge it in liquid nitrogen. Quote So if the voltage is 0.000 how can there be any power dissipated across the coil? ... please explain where the power comes from. But the voltage was not 0 when they charged the coil,as the coil was charged before being submerged in liquid nitrogen,and becoming super conductive. So,the power to charge the coil would have been the maximum power that there power supply could have delivered to the coil before it was made super conductive. The video shows exactly what i said--you cannot charge the inductor once it becomes super conductive,as it will reject any magnetic field that tries to penetrate it. Even if the voltage was 0 across the coil,it will never be 0 within the transformer of the power supply. So even if the super conductor dose not dissipate any power,the power supply being used to power up the super conductor will,and it will dissipate the maximum amount of power it is capable of,because you just dropped a dead short across it. The other video you posted,where the guy has a coil under some flat bar,which is sitting on the scales,clearly shows a massive increase in current draw when he cools the coil with liquid nitrogen to bring the resistance down. Before he cools the coil,there is no arcing of the wire when he touches the coil on the battery. When he cools the coil with liquid nitrogen to reduce the coils resistance,and then connects it to the battery,you can see massive arcing of the wire,which clearly means a massive increase of power input to the coil,as we could assume that the batteries voltage would remain fairly stable between the two tests. Brad --------------------------- Never let your schooling get in the way of your education.

TinMan	Re: Dose it take power to create a magnetic field « Reply #13 on: 2019-02-16, 00:48:30 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: Reiyuki on 2019-02-15, 23:53:22 I think he may mean 'how much NET energy does it take to create a magnetic field?' There is indeed a defined amount of energy required to establish the field, but the field collapse returns nearly all of this back into the system. A perfect inductor and perfect capacitor would exchange energy forever without losses. A nearly perfect inductor and capacitor will exchange energy with an extremely high Q factor. And once you want to draw energy out of this perfect system,what happens ? I fail to see any OU in this as Luc is claiming. Brad --------------------------- Never let your schooling get in the way of your education.

poynt99	Re: Dose it take power to create a magnetic field « Reply #14 on: 2019-02-16, 00:59:06 »
Group: Administrator Hero Member Posts: 3208 It's not as complicated as it may seem...	Quote from: TinMan on 2019-02-15, 23:37:46 If the coil has no resistance,then it has no inductance. How is P/in calculated when R=0 ?. You cannot create a magnetic field while the inductor is in a super conductive state. Please explain. --------------------------- "Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe." Frank Zappa

gotoluc	Re: Dose it take power to create a magnetic field « Reply #15 on: 2019-02-16, 01:11:35 »
Group: Elite Experimentalist Hero Member Posts: 901	Quote from: TinMan on 2019-02-16, 00:45:29 Yes,i watched the video Luc,but i dont think you paid attention to what they did in that video. What they showed was a complete waste of time and effort. They clearly state at 5:40 in the video-->to charge the device,we use a 20 amp 5v power supply. Once connected to the circuit,we then submerge the device in liquid nitrogen. That does not mean they applied 5v @ 20 amps. They are just confirming the size of power supply used. Also, they would of had to connect the circuit to the coil before placing it in the Liquid Nitrogen. So that statement is not saying the energized the coil before placing it in the Nitrogen. That would be pointless to do such a thing, Quote from: TinMan on 2019-02-16, 00:45:29 So,it is exactly as i said it is. First the coil has to be energised,and then you submerge it in liquid nitrogen. That is your saying. Nowhere did they say they energized the coil before placing it in the Nitrogen. Quote from: TinMan on 2019-02-16, 00:45:29 The other video you posted,where the guy has a coil under some flat bar,which is sitting on the scales,clearly shows a massive increase in current draw when he cools the coil with liquid nitrogen to bring the resistance down. Before he cools the coil,there is no arcing of the wire when he touches the coil on the battery. When he cools the coil with liquid nitrogen to reduce the coils resistance,and then connects it to the battery,you can see massive arcing of the wire,which clearly means a massive increase of power input to the coil,as we could assume that the batteries voltage would remain fairly stable between the two tests. Brad I did write that his video is not suited for any power evaluation. However, did you not consider that the large spark can be the now large inductive discharge? Cheers Luc

TinMan	Re: Dose it take power to create a magnetic field « Reply #16 on: 2019-02-16, 01:13:54 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: poynt99 on 2019-02-16, 00:59:06 Please explain. If the coil has no resistance,then it has no inductance. How is P/in calculated when R=0 ?. You cannot create a magnetic field while the inductor is in a super conductive state. I thought it was self explanatory. 1-If the coil has no resistance,then it has no inductance. Inductance in a coil creates the BEMF-dose it not ? BEMF is part of the effective resistance value,where the wire resistance is the other part of the effective resistance of an inductor. So,if there is 0 resistance,there is neither any wire resistance,nor is there any BEMF resistance.If there is no BEMF resistance,then there is no inductance. 2-How is P/in calculated when R=0 ?. This is a straight forward question,so i fail to see the problem here. 3-You cannot create a magnetic field while the inductor is in a super conductive state Is that statement not correct?,as a true superconductor will reject any magnetic field that tries to penetrate it. Brad --------------------------- Never let your schooling get in the way of your education.

TinMan	Re: Dose it take power to create a magnetic field « Reply #17 on: 2019-02-16, 01:25:33 »
Group: Elite Experimentalist Hero Member Posts: 4609	author=gotoluc link=topic=3723.msg72573#msg72573 date=1550279495] Quote I did write that his video is not suited for any power evaluation. However, did you not consider that the large spark can be the now large inductive discharge? Of course the discharge will be greater,as the input power increase a lot as well. Quote That does not mean they applied 5v @ 20 amps. They are just confirming the size of power supply used. Also, they would of had to connect the circuit to the coil before placing it in the Liquid Nitrogen. So that statement is not saying the energized the coil before placing it in the Nitrogen. That would be pointless to do such a thing, That is your saying. Nowhere did they say they energized the coil before placing it in the Nitrogen. Lets say your right. We can already get an LED to flash using a normal coil when we disconnect the current. I do agree that a super conductor will not dissipate any power,but you continually fail to take into account the power that the supply will be dissipating as heat. So how can any OU be had from this system if power is being dissipated by circuit components ?. Brad --------------------------- Never let your schooling get in the way of your education.

gotoluc	Re: Dose it take power to create a magnetic field « Reply #18 on: 2019-02-16, 01:37:36 »
Group: Elite Experimentalist Hero Member Posts: 901	The link below starts 3:44 Hit pause then click on wheel (settings) and select speed at 0.5 to slow it down. Hit play and you can see he charges the coil when in Nitrogen. You will see a blue light when he powers the coil, then immediately when the blue light goes out you will see the LED flash, discharging the coil. He repeats the twice and each time it does the same thing. https://youtu.be/PifnlZigp6c?t=224 Regards Luc

gotoluc	Re: Dose it take power to create a magnetic field « Reply #19 on: 2019-02-16, 01:53:56 »
Group: Elite Experimentalist Hero Member Posts: 901	Quote from: TinMan on 2019-02-16, 01:25:33 Lets say your right. We can already get an LED to flash using a normal coil when we disconnect the current. Correct but at a loss because you now agree that a super conductor will not dissipate any power... and that's all I'm bringing to your attention. Quote from: TinMan on 2019-02-16, 01:25:33 I do agree that a super conductor will not dissipate any power,but you continually fail to take into account the power that the supply will be dissipating as heat. So how can any OU be had from this system if power is being dissipated by circuit components ?. Brad True, power supplies loaded down to the millivolt range may not be efficient and why I mentioned 2500 Farad capacitors could be used. You can charge those in the millivolt range and they will deliver gobs of current efficiently. I don't think there is anyone here that has any working experience with super conducting coils, so we still have no real knowledge what is truly needed to charge them. Regards Luc

TinMan	Re: Dose it take power to create a magnetic field « Reply #20 on: 2019-02-16, 01:55:49 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: gotoluc on 2019-02-16, 01:37:36 The link below starts 3:44 Hit pause then click on wheel (settings) and select speed at 0.5 to slow it down. Hit play and you can see he charges the coil when in Nitrogen. You will see a blue light when he powers the coil, then immediately when the blue light goes out you will see the LED flash, discharging the coil. He repeats the twice and each time it does the same thing. https://youtu.be/PifnlZigp6c?t=224 Regards Luc Ok,so he charges up the coil,and then disconnects the coil,and the LED flashes. I have to ask-->what is so great about that? We can do exactly the same with a standard coil. Now,lets say the coils resistance was 0 ohm's-->how would you calculate the power used to energise that coil?,so as you can get the little LED to flash That question is one i am asking you Luc--how would you calculate the energy used to power up that coil,when the resistance value is 0 Brad --------------------------- Never let your schooling get in the way of your education.

TinMan	Re: Dose it take power to create a magnetic field « Reply #21 on: 2019-02-16, 02:03:43 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: gotoluc on 2019-02-16, 01:53:56 Correct but at a loss because you now agree that a super conductor will not dissipate any power... and that's all I'm bringing to your attention. True, power supplies loaded down to the millivolt range may not be efficient and why I mentioned 2500 Farad capacitors could be used. You can charge those in the millivolt range and they will deliver gobs of current efficiently. I don't think there is anyone here that has any working experience with super conducting coils, so we still have no real knowledge what is truly needed to charge them. Regards Luc Yes,i have always agreed that a superconductor will dissipate no power. But the thread is about you claim that the magnetic field comes for free,where i state that it dose not. Think about what your claim means-- If it takes no energy to create the field,but you can get energy back from that collapsing field,then you have just done what physics has told us we cannot do--create energy. With an ideal power supply,and an ideal coil,the best we could do is 100%. If we go over this 100%,then we now start to create energy--the thing we are told we cannot do. Brad --------------------------- Never let your schooling get in the way of your education.

gotoluc	Re: Dose it take power to create a magnetic field « Reply #22 on: 2019-02-16, 02:14:20 »
Group: Elite Experimentalist Hero Member Posts: 901	Quote from: PhysicsProf on 2019-02-15, 22:51:32 Sorry, Luc, I have a hard time believing this. The B field stores energy, therefore one would say that energy should be required to produce it, beyond the wire resistance (loss). So how is it Quote from: gotoluc on 2019-02-15, 21:31:59 it's now confirmed a magnetic field is free and it's only wire resistance that keep us away from this reality How confirmed? Let's look at it in another way. We have a one Dollar bill which represents energy and we have a bottle of Coke which represents a magnetic field. You go to a vending machine and insert your one Dollar bill and it dispenses you a Coke plus returns 4 x .25 cent quarters. So you walk away with a Coke and one Dollar in quarters. Was the Coke free? Regards Luc

TinMan	Re: Dose it take power to create a magnetic field « Reply #23 on: 2019-02-16, 02:23:55 »
Group: Elite Experimentalist Hero Member Posts: 4609	Quote from: gotoluc on 2019-02-16, 02:14:20 How confirmed? Let's look at it in another way. We have a one Dollar bill which represents energy and we have a bottle of Coke which represents a magnetic field. You go to a vending machine and insert your one Dollar bill and it dispenses you a Coke plus returns 4 x .25 cent quarters. So you walk away with a Coke and one Dollar in quarters. Was the Coke free? Regards Luc No,as you dissipated energy walking to the vending machine,and inserting and collecting money. But here is something i want you all to think about. If a superconductor has !!no!! resistance,it also has no inductance. If it had inductance,then it would produce a BEMF. If it produced a BEMF,then it would have resistance,as BEMF is an effective resistance to current flow. If there is no inductance,then there is no collapsing magnetic field from which to capture the inductive kickback energy from. The conservation of energy stands Brad --------------------------- Never let your schooling get in the way of your education.

Magluvin	Re: Dose it take power to create a magnetic field « Reply #24 on: 2019-02-16, 02:31:23 »
Group: Mad Scientist Hero Member Posts: 546	Quote from: TinMan on 2019-02-16, 01:55:49 Ok,so he charges up the coil,and then disconnects the coil,and the LED flashes. I have to ask-->what is so great about that? We can do exactly the same with a standard coil. Now,lets say the coils resistance was 0 ohm's-->how would you calculate the power used to energise that coil?,so as you can get the little LED to flash That question is one i am asking you Luc--how would you calculate the energy used to power up that coil,when the resistance value is 0 Brad Well, hopefully a 0ohm super coil has inductance/impedance so that an input could be applied in pulses without killing off the input to a dead short, etc. Like if the super coil were used as a gen coil, would there be a voltage across that coil when we turn the gen??? Could there be a voltage across the coil? Had some discussion some years back on 0ohm coils and their inductance. Would a perfect coil even allow current to flow ever? Like the magnet floating above a super conductor, could there be that sort of effect in a super coil and no current could flow? Dont know because Ive never played with one, but my theory was that it cant pass current because the reverse emf of the self inductance, which impedes the input may be always equal to the input. And I theorized that there may have to be some resistance in order for the reverse emf to always be lower than the input to allow for current and the mag field to rise. I visualize the possibility of a chilled coil such as Luc is going to give a go, may have less voltage than at room temp. Maybe not. Hopefully not. But it should provide more current, for sure. Lol, just a thought from what I just wrote. The floating magnet on the super conductor... If its floating and we push down on the magnet and it springs back upward against the push downwards, what if a super coil could somehow produce more reverse emf than the input. That would be something. Just connect the coil to the battery and the battery charges. Would be sweet if it were that simple. Mags

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