SAT Subject Physics Practice Question 521: Answer and Explanation

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Question: 521


C1 is an uncharged capacitor (shown in the circuit above). At t = 0 the switch (SW1) is closed, and C1 begins to charge.

Which of the graphs above best represents the charge on the capacitor as time passes?

A. Time A
B. Time B
C. Time C
D. Time D
E. Time E

Correct Answer: A


The correct answer is (A). Charge builds across a capacitor at a high rate when voltage is initially applied. The rate of charge on the capacitor decreases with time as the capacitor builds charge.

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