Electro Magnetic Induction And Alternating Currents Question 114
Question: 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.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: C
Solution:
When ac flows through an inductor current lags behind the emf., by phase of p/2, inductive reactance, $ X_{L}=\omega L=\pi .2f.L, $ so when frequency increases correspondingly inductive reactance also increases.
