Assertion :In series $L - C - R$ circuit, voltage will lead the current function for frequency greater than the resonance frequency. Reason: At resonance frequency, phase difference between current function and voltage function is zero.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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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
At resonance frequency, $f_{r}$
$X_{C} = X_{L}$
Now, $X_{L} = 2 π f L$ or $X_{L} \propto f$
For $f > f_{r}, X_{L} > X_{C}$
At resonance, $X_{L} = X_{C} \Rightarrow Z = R$
$∴ cos ϕ = \frac{R}{Z} = 1$ or $ϕ = 0^{0}$

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Assertion :In series L−C−R circuit, voltage will lead the current function for frequency greater than the resonance frequency. Reason: At resonance frequency, phase difference between current function and voltage function is zero.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionAt resonance frequency, frXC=XLNow, XL=2πfL or XL∝fFor f>fr,XL>XCAt resonance, XL=XC⇒Z=R∴cosϕ=RZ=1 or ϕ=00

Assertion :In series $L - C - R$ circuit, voltage will lead the current function for frequency greater than the resonance frequency. Reason: At resonance frequency, phase difference between current function and voltage function is zero.