A $2.0 - \mu \mathrm { F }$ Capacitor Is Charged To

Multiple Choice

A $2.0 - \mu \mathrm { F }$ capacitor is charged to $12 \mathrm {~V}$ and then discharged through a $4.0 - \mathrm { M } \Omega$ resistor. How long will it take for the voltage across the capacitor to drop to $3.0 \mathrm {~V}$ ?

A) $11 \mathrm {~s}$
B) $8.0 \mathrm {~s}$
C) $22 \mathrm {~s}$
D) $24 \mathrm {~s}$