Alternating Current Frequency Flowing Circuit Containing Resistance And Choke Series

An alternating current of frequency ‘f’ is flowing in a circuit containing a resistance R and a choke L in series. … √[R2 + L2] …

Answers:

The correct option (b) √[R² + 4π²f²L²]

 Explanation:

 Circuit is R – L series circuit, hence impedance

 z = √[R² + ω²L²]

z = √[R² + (2πf)²L²]

 z = √[R² + 4π²f²L²]