A 1 000-V Battery,a 3 000-Ω Resistor,and a 0

Multiple Choice

A 1 000-V battery,a 3 000-Ω resistor,and a 0.50-μF capacitor are connected in series with a switch.The time constant for such a circuit,designated by the Greek letter,τ,is defined as the time that the capacitor takes to charge to 63% of its capacity after the switch is closed.What is the current in the circuit at a time interval of τ seconds after the switch has been closed?

A) 0.14 A
B) 0.21 A
C) 0.12 A
D) 0.32 A