Q. 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
Explanation
(b) The coil has 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
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.