Electro Magnetic Induction And Alternating Currents Question 116
Question: Assertion : When capacitive reactance is smaller than the inductive reactance in LCR current, 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.
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: B
Solution:
The phase angle for the LCR circuit is given by $ \tan \varphi =\frac{X_{L}-X_{C}}{R}=\frac{\omega L-1/\omega C}{R} $ Where XL, XC are inductive reactance and capacitive reactance respectively when XL > XC then tanf is positive i.e. f is positive (between 0 and p/2). Hence emf leads the current.
