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Capacitors - Technical MCQs

Q1:

What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant?

A 37.8 V

B 38 V

C 63 V

D 101 V

ANS:C - 63 V

One time constant is equal to 0.63. So for 100 volts, =100*0.63, =63.