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In a black box of unknown elements (L or...

In a black box of unknown elements (L or R or any other combination), an ac voltage `E=E_(0) sin (omegat)+phi)` is applied and current in the circuit was found to be `I=I_0` sin [ omega t + phi + (pi//4)]`. Then the unknown elements in the box may be

A

only capacitor

B

inductor and resistor both

C

either capacitor, resistor, and inductor or only capacitor and resistor

D

only resistor

Text Solution

Verified by Experts

The correct Answer is:
C
Since current is leading emf, capacitor must be present in the circuit. Along with capacitor, there can be either (i) only resistor or (ii) resistor and inductor if `(X_C) gt(X_L)`.
In both of the above conditions, we can obtain a phase differnece of `(pi//4)` with current leading emf.
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