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NEET 2011 Physics question

PhysicsAlternating CurrentNEET 2011

A coil has resistance and inductive reactance at frequency. If an ac source, of , , is connected across the coil, the current in the coil will be :

Answer: (1)

Solution

Inductive reactance is proportional to frequency. At , , so at it doubles to . The resistance stays . Impedance \sqrt{R^2 + X_L'^2}$ =

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Question ID VK-090752