At a certain frequency

PHYSICS · Subjective · CBSE · Physics · Alternating Current · Alternating Current

Problem

At a certain frequency ff, a series RLC circuit has XL=40 ΩX_L = 40\,\Omega, XC=80 ΩX_C = 80\,\Omega and resistance R=10 ΩR = 10\,\Omega. Keeping the supply voltage amplitude unchanged, the frequency is doubled to 2f2f. Calculate the ratio of the current amplitudes I′I\dfrac{I'}{I} at 2f2f and at ff.

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