Physics - Current Electricity Question with Solution | TestHub

Two moving coil galvanometers ${\mathrm{M}}_1$ and ${\mathrm{M}}_2$ have the following particulars: ${\mathrm{N}}_1$ (number of turns in the coil) $=30$, ${\mathrm{A}}_1$ (area of the coil) $=3.6\times 10^{-3}{\mathrm{m}}^2$, ${\mathrm{B}}_1=0.25\mathrm{T}$, ${\mathrm{N}}_2=42$, ${\mathrm{A}}_2=1.8\times 10^{-3}{\mathrm{m}}^2$, ${\mathrm{B}}_2=0.50\mathrm{T}$. (The spring constants are identical for the two meters). Determine the ratio of current sensitivity (deflection per unit current) of ${\mathrm{M}}_2$ and ${\mathrm{M}}_1$.