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Q.

An inductor of 0.5 mH, a capacitor of 20 μF and resistance of 20Ω are connected in series with a 220 V ac source. If the current is in phase with the emf, the amplitude of current of the circuit is xA. The value of x is

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answer is 242.

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Detailed Solution

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When current is in phase with emf of source, then current i is

 i=VR=22020=11A

∴x=121

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