Question

The resistance of a coil for $DC$ is in ohms. Irr $AC$, the resistance

• A. Will remain same
• B. Will increase
• C. Will decrease
• D. Will be zero

Answer 1

Answer: (B)

The coil has 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 $DC$.