College Physics : Faraday's Law of Induction

Study concepts, example questions & explanations for College Physics

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Example Questions

Example Question #2 : Electromagnetics

A single string of wire has a resistance of . If the wire is connected to a  power source, what is the strength of the magnetic field  away from the wire?

Possible Answers:

Correct answer:

Explanation:

So this is all about the magnetic field strength around a current carrying wire.

The equation for this is:

But you must use Ohm's Law  in order to find the current in the wire.

Since the wire has  of resistance and the voltage through the wire is , that means the current in the wire is .

Being sure to change  into , plug everything in and get the answer, which is

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