SAT Subject Physics Practice Question 334: Answer and Explanation

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Question: 334

30.

Based on the diagram above, which of the following statements describes the quantities induced into the iron core when SW1 is closed?

A. Lines of force emanate from side y.
B. Lines of force emanate from side x.
C. Side y becomes a south magnetic pole.
D. Side x becomes a north magnetic pole.
E. The electric field cancels the magnetic field.

Correct Answer: B

Explanation:

The correct answer is (B). To find the correct pole of the electromagnet, use the right-hand rule. Wrap your fingers around the core, pointing them in the direction of the positive flow. Your thumb points to the north pole.

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