SAT Subject Physics Practice Question 104: Answer and Explanation

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Question: 104

4. A square loop of wire (side length = s) surrounds a long, straight wire such that the wire passes through the center of the square.

If the current in the wire is I, determine the current induced in the square loop.

A.
B.
C.
D.
E. 0

Correct Answer: E

Explanation:

Since the current in the straight wire is steady, there is no change in the magnetic field, no change in magnetic flux, and, therefore, no induced emf or current.

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