SAT Subject Physics Practice Question 604: Answer and Explanation

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Question: 604


Two wires are aligned side by side as shown above. They are both hooked into different circuits in which the current is off. A switch is closed, allowing current to flow into each circuit. Which of the following statements is correct?

A. The two currents destructively interfere with one another.
B. The two currents constructively interfere with one another.
C. The two wires attract and move closer.
D. The two wires repel and move away.
E. The two wires remain still.

Correct Answer: D


The correct answer is (D). As two wires with opposite currents tend to repel each other.

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