Assertion : The alternating current lags behind the e.m.f. by a phase angle of π / 2 , when AC flows through an inductor. Reason : The inductive reactance increases as the frequency of AC source decreases.

Q124 / 180 · AIIMS 2008 · Physics

Assertion : The alternating current lags behind the e.m.f. by a phase angle of $\pi / 2$, when AC flows through an inductor. Reason : The inductive reactance increases as the frequency of AC source decreases.

A
If both assertion and reason are true and reason is the correct explanation of assertion
B
If both assertion and reason are true but reason is not the correct explanation of assertion
Correct answer
C
If assertion is true but reason is false
D
If both assertion and reason are false.

Assertion is correct but reason is false because inductance reactance $X_L=2 \pi f L$. So, higher frequency greater inductance reactance.

Hence, the correct answer is option: 'C'.