A 1000-V Battery, a 3000- $\Omega$ Resistor, and a 0 $\mu$ F Capacitor Are Connected in Series with a Switch

question 20

Multiple Choice

A 1000-V battery, a 3000- $\Omega$ resistor, and a 0.50- $\mu$ F capacitor are connected in series with a switch. The time constant for such a circuit, designated by the Greek letter, $\tau$ , 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 $\tau$ seconds after the switch has been closed?

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

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