The current in an RL circuit is zero at time t = 0 and increases to 75% of its final value in 4.5 s.The time constant of this circuit is approximately
A)6.0 s
B)12 s
C)8.7 s
D)3.3 s
E)9.8 s

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The Answer of The current in an RL circuit is zero at time t = 0 and increases to 75% of its final value in 4.5 s.The time constant of this circuit is approximately
A)6.0 s
B)12 s
C)8.7 s
D)3.3 s
E)9.8 s

The Current in an RL Circuit Is Zero at Time