A Series RC Circuit Has a Time Constant of 1

Multiple Choice

A series RC circuit has a time constant of 1.0 s.The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA.The capacitor is initially uncharged.What is the charge on the capacitor 2.0 s after the switch is closed?

A) 0.43 C
B) 0 66 C
C) 0.86 C
D) 0.99 C