Electricity and Magnetism

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Moderate

Voltage on a Charging Capacitor

EANDM-@PIYRY

In the RC circuit below the capacitor is initially uncharged. At time $t = 0 \:\text s$ the switch is closed and the capacitor begins to charge. The circuit parameters are: $\Delta V = 12 \:\text V$, $R = 120 \:\text M \Omega$, $C= 30 \: \text {pF}$.

Created for Albert.io. Copyright 2016. All rights reserved.

What is the voltage across the capacitor at $t = 4.5 \:\text {ms}$?

A

$3.4 \: \text V$

B

$100 \: \text {mV}$

C

$9.7 \: \text V$

D

$8.6 \: \text V$

E

$11.9 \: \text V$