Another "Good Saturday Afternoon Project with the Kids"Faradays Electromagnetic LabRun the "faraday_en.jar" file [unzip first] (opens the application in a window);
* Preferences | Privacy | uncheck Allow sending info to PhET, if you don't want anon info sent.
- Select "Electromagnet";
- Starts with a Battery and Compass, now, also show the Field Meter;
- Align compass and field meter to horizontal center of the coil (move Battery/Coil up a bit);
- Align the Field Meter to where B & Bx are equal, and By and Phase are 0 (Battery at 10V);
Now, move the Battery Voltage from 10V to 0V (center position with mouse);
Quickly move between 0V and 10V, try not to go negative (a bit tricky at first).
Notice how the Compass and Field Meter respond! [Pulsed DC into a coil? Field reaction?]
For comparison try the Pickup Coil application (this is what we are all familiar with).
Question: Is this annimation correct? Test it using the Supplemental below.
The simulation is found here:
https://phet.colorado.edu/en/simulations/browse (scroll to the right a bit)
Physics - Faraday's Law - related sims (bottom) "Faraday's Electromagnetic Lab."
https://phet.colorado.edu/en/simulations/faraday [legacy java version download, if needed]
(program attached in a 7z zip file)
SupplementalA good Saturday afternoon exercise with the Kids - download "Gauss Meter" on an Android
phone or Tablet. And, wrap a few turns of wire around a Nail (or whatever) to form a Coil.
Remove the Nail from the Coil and touch the Coil terminals to Battery terminals, record the Gauss.
Repeat the process again but with the Nail inside the Coil and record the Gauss!
Question: Did the Iron Nail provide any "Magnetic Field" gain w.r.t. the air Coil? Try more wire turns and/or nails, and so forth...
Don't saturate your "Meter" - but, to reset the phone magnetometer, move it around for a bit.
SL