A Capacitor Is Connected in Series with a Resistor and a Switch

question 1

Multiple Choice

A capacitor is connected in series with a resistor and a switch. With the switch open, the capacitor is charged to 9.0 V. When the switch is closed, how long will it take for the voltage across the capacitor to drop to 6.0 V if the time constant of the circuit is 4.0 s?

• A) 0.3 s
• B) 1.2 s
• C) 1.6 s
• D) 2.7 s
• E) 12 s