Solution-When being chargerd by a 40 volt dc supply find

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Given that the instantaneous voltage across a capacitor is

vc=40(1-e-t/CR)Volts

When being chargerd by a 40 volt DC supply, find the time,t for vc to reach 20 volts after the charging process has started if C=200μF and R=10kΩ.

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