The number of turns of the coil of a moving coil galvanometer is increased in order to increase curr

Question

The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be

Professor PC Thomas Classes · Answer

Voltage sensitivity $V_s = I_s/R$. If $N$ increases by $50\%$, $I_s$ increases by $50\%$ but $R$ also increases by $50\%$, so $\Delta V_s = 0\%$.