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A charged capacitor is connected to a resistor and switch as in the figure below. The circuit has a time constant of 0.900 s. Soon

A charged capacitor is connected to a resistor and switch as in the figure below. The circuit has a time constant of 0.900 s. Soon after the switch is closed, the charge on the capacitor is 80.0% of its initial charge.

(a) Find the time interval required for the capacitor to reach this charge.

(b) If R = 250 kΩ, what is the value of C ?

R-

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