The time constant of an RC circuit is defined as the time taken by the voltage across the

The time constant of an RC circuit is defined as the time taken by the voltage across the capacitor to become_____ of its final value 

 (a) 63.2% (b) 36.8% (c) 50% (d) 100%  
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Answer :

The time constant of an RC circuit is defined as the time taken by the voltage across the capacitor to become 63.2% of its final value 

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