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SAT® Subject Test in Physics

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Capacitance from Current

SATPHY-KEKQGC

The circuit pictured below shows a battery, two resistors, an uncharged capacitor and a switch. The resistor values are shown.

The switch is closed, and after an average current of $2.0\, A$ flows for $6.0\, s$, the voltage across the capacitor is $4.0\, V$.

What is the capacitance of the capacitor?

A

$4.0\, F$

B

$3.0\, F$

C

$36.0\, F$

D

$12.0\, F$

E

$8.0\, F$