Q.

The resistance of a coil for DC is R ohms. In AC, the resistance

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a

Will remain same

b

Will increase

c

Will decrease

d

Will be zero

answer is B.

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Detailed Solution

The coil has inductance L besides the resistance R. Hence, for AC its effective resistance R2+XL2 will be larger than its resistance R for DC.
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The resistance of a coil for DC is R ohms. In AC, the resistance