SAT Subject Physics Practice Question 244: Answer and Explanation

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Question: 244

15. Which of the following best describes the magnetic field lines created by a long, straight, current-carrying wire?

A. Rays that emanate from the wire
B. Circles centered on the wire
C. Lines parallel to the wire
D. Lines perpendicular to the wire
E. Noncircular ellipses centered on the wire

Correct Answer: B

Explanation:

The magnetic field lines created by a long, straight, current-carrying wire are circles centered on the wire.

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