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Select the correct options among the fo...

Select the correct options among the following In an `R-C` circuit
(a) instantaneous `A.C` is given by `I = I_(0) sin (wt + phi)`
(b) the alternating current in the circuit leads the emf by a phase angle `phi`.
(c) Its impedance is `sqrt(R^(2) + (omega C)^(2))`
(d) It capacitive reactance is `omega c`

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