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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

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The phase angle for the LCR circuit is given by
tanϕ=XLXCR=ωL1/ωCR
Where XL,XC are inductive reactance and capacitive reactance respectively when XL>XC then tanϕ is positive i.e., ϕ is positive (between 0 and π/2 ) . Hence emf leads the current.
The phase angle is the angle between the alternating e.m.f. and alternating current of the circuit
hence option B is correct.

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