An Uncharged 5

Multiple Choice

An uncharged 5.0-µF capacitor and a resistor are connected in series to a 12-V battery and an open switch to form a simple RC circuit.The switch is closed at t = 0 s.The time constant of the circuit is 4.0 s.
-What is the charge remaining on either plate after one time constant has elapsed?

A) 7.4 × 10^-⁵ C
B) 5.5 × 10^-⁵ C
C) 1.2 × 10^-⁵ C
D) 3.8 × 10^-⁵ C
E) 2.2 × 10^-⁵ C