The resistance of a coil for dc is in ohms. In ac, the resis... | PHYSICS - AC VOLTAGE APPLIED TO A RESISTOR | SolveeIt | Solveeit

Today, August 19

Question

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

A

Will remain same

B

Will increase

C

Will decrease

D

Will be zero

Answer

Will increase

Explanation

Solution

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