First slide

AC Circuits

Question

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

Moderate

A

Will remain same
B

Will increase
C

Will decrease
D

Will be zero

Solution

The coil having inductance L besides the resistance R. Hence for ac its effective resistance $\sqrt{R^{2} + X_{L}^{2}}$ will be larger than its resistance R for dc.

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