Electric motors & faraday's law

AI Thread Summary
Eliza's experiment involves connecting a power supply, switch, and multimeter in series with a wire coil, where part of the wire is stripped of insulation. The coil's orientation affects current flow, with the bare section allowing current while the coated part does not. When current flows through the coil, one side will act as a north pole and the other as a south pole, depending on the direction of the current. The behavior of the coil when placed above a magnet with the switch closed is also questioned, indicating the need for visual aids to clarify the setup. Understanding Faraday's Law is essential for analyzing the magnetic flux and current behavior in this scenario.
jackd
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Homework Statement


Eliza connects a power supply, switch, and a multimeter (in ammeter mode) in series with a wire coil. The wire coil is held into place by 2 connecting wire leads. One of the wire leads has been stripped off of the insulating enamel coating so that half the wire is bare; the other lead has been completely stripped bare.

1. What orientations of the coil will give a current through it due to the battery?

2. During the time that there is a current through the coil, which side of the coil will act like a north pole and which side will act like a south pole? Explain?

3. How will the coil behave when placed above the magnet and the switch is closed?


Homework Equations


Faraday's Law: E=-d(magnetic flux)/dt
Magnetic Flux = B*Acos(\theta


The Attempt at a Solution


The part without coating will give a current, but the part that has coating will not?
Very lost...
 
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jackd said:
The part without coating will give a current, but the part that has coating will not?

Yes.

For the rest, it's hard to see what's going on without a figure.
 
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