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The resistor in an RC circuit has a resistance of 145

Chapter 21, Problem 82P

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QUESTION:

Problem 82P

The resistor in an RC circuit has a resistance of 145 Ω.

(a) What capacitance must be used in this circuit if the time constant is to be 3.5 ms?

(b) Using the capacitance determined in part (a), calculate the current in the circuit 7.0 ms after the switch is closed. Assume that the capacitor is uncharged initially and that the emf of the battery is 9.0 V.

Questions & Answers

QUESTION:

Problem 82P

The resistor in an RC circuit has a resistance of 145 Ω.

(a) What capacitance must be used in this circuit if the time constant is to be 3.5 ms?

(b) Using the capacitance determined in part (a), calculate the current in the circuit 7.0 ms after the switch is closed. Assume that the capacitor is uncharged initially and that the emf of the battery is 9.0 V.

ANSWER:

Step 1 of 3

(a) The time constant for the circuit is given by,

Implies the capacitance,

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