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Solution


Q.

Using a variable frequency a.c. voltage source the maximum current measured in the given LCR circuit is 50 mA for V = 5sin(100t). The values of L and R are shown in the figure. The capacitance of the capacitor (C) used is ______ µF.                 [2026]

Ans.

(50)

Current is maximum, so resonance

and ω=1LC

C=1ω2L=12×104

=50×10-6=50 μF