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Q.

The resistance of a coil for dc is in 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 having 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 in ohms. In ac, the resistance