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1. A series RL circuit is excited by a voltage v(t) = Vm sin (ωt + Φ). The transient current will be zero if
(A): Φ = 0
(B): ω = 0
(C): Φ = tan-1 (ωL/R)
(D): ω - tan-1 (ωL/R) = p /2
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