SAT Subject Physics Practice Question 434: Answer and Explanation

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Question: 434

10. As a battery ages, its internal resistance increases. This causes the current in the external circuit to

A. remain the same.
B. polarize.
C. reverse direction.
D. increase.
E. decrease.

Correct Answer: E


The correct answer is (E). The higher internal resistance in the battery leads to a reduction in the terminal potential of the battery. The lower terminal potential can produce less current in the circuit.

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