SSC JE Electrical Engineering 2012 Paper

An ac meter of resistance ${\mathit{R}}_{\mathit{m}}$ and reactance ${\mathit{X}}_{\mathit{m}}$ is connected in series with a resistance ${\mathit{R}}_{\mathit{s}}$. A shunt of impedance $\left({\mathit{R}}_{\mathrm{sh}}+\mathit{j}{\mathit{X}}_{\mathrm{sh}}\right)$ is applied in parallel to the esisting combination of meter and ${\mathit{R}}_{\mathit{s}}$. The current division across the two branches will be independent of frequency when