JEE MAIN - Physics (2021 - 27th July Evening Shift - No. 8)

A 100$$\Omega$$ resistance, a 0.1 $$\mu$$F capacitor and an inductor are connected in series across a 250 V supply at variable frequency. Calculate the value of inductance of inductor at which resonance will occur. Given that the resonant frequency is 60 Hz.
0.70 H
70.3 mH
7.03 $$\times$$ 10$$-$$5 H
70.3 H

Explanation

C = 0.1 $$\mu$$F = 10$$-$$7 F

Resonant frequency = 60 Hz.

$${\omega _0} = {1 \over {\sqrt {LC} }}$$

$$2\pi {f_0} = {1 \over {\sqrt {LC} }} \Rightarrow L = {1 \over {4{\pi ^2}f_0^2C}}$$

by putting values $$L \simeq 70.3$$ Hz.

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