Question

In the circuit shown, X is joined to Y for a long time, and then X is joined to Z. The total heat produced in $R_2$ is

• A. $\frac{L{E}^2}{2R_1^2}$
• B. $\frac{L{E}^2}{2R_2^2}$
• C. $\frac{L{E}^2}{2R_1{R}_2}$
• D. $\frac{L{E}^2{R}^2}{2R_1^2}$

Answer 1

The correct option is A $\frac{L{E}^2}{2R_1^2}$

Energy stored in the inductor = $U=\frac{1}{2}L{i}^2$ where $i=\frac{E}{R_1}$. This energy is dissipated as heat in $R_2$ when the switch is connected to Z.