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The resistance of a coil for direct curr...

The resistance of a coil for direct current is `10 Omega`. An alternating current is sent through it. Will its resistance remain the same ?

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No, the resistance of the coil will not remain the same. It will increases to `Z = sqrt(R^(2) + (omega L)^(2))`, which is obviously more.
When potential difference is constant, heat produced/sec in inversely proportional to resistance. Hence heat produced/sec in case of a.c. will be less compared to heat produced/sec in case of d.c.
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