Question

Assertion: When capacitive reactance is smaler than the inductive reactance is `LCR` circuit, e.m.f. leads the current.
Reason : The phase angle is the angle between the alternating e.m.f. and alternating current of the circuit.
A. If both the assertion and reason are true and reason is a true explantion of the assertion.
B. If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.
C. If the assertion is true but reason false
D. If both the assertion and reason are false.

Answer 1

Correct Answer - B
The phase angle for the `LCR` circuit is given by
`tan varphi=(X_(L)-X_(C))/R=(omegaL-1//omegaC)/R` where `X_(L),X_(C)`are inductive reactance and capacitance reactance respectively when `X_(L)gtX_(C)` then `tan phi` is positive i.e., `phi` is positive (between `0` and `pi//2`). hence, e.m.f leads the current.