Physics - Current Electricity Question with Solution | TestHub

Moving coil galvanometers ${\mathrm{M}}_1$ and ${\mathrm{M}}_2$ have resistance, number of turns, area of coil and magnetic field as follows. ${\mathrm{R}}_1=10\Omega ,{\mathrm{R}}_2=14\Omega ,{\mathrm{N}}_1=30,{\mathrm{N}}_2=42$ ${\mathrm{A}}_1=3\cdot 6\times 10^{-3}{\mathrm{m}}^2,{\mathrm{A}}_2=1\cdot 8\times 10^{-2}{\mathrm{m}}^2,{\mathrm{B}}_1=0\cdot 25\mathrm{T},{\mathrm{B}}_2=0\cdot 50\mathrm{T}$ (Spring constants are same for both materials) The ratio of (i) current sensitivity and (ii) voltage sensitivity for galvanometer $({\mathrm{M}}_2$ to ${\mathrm{M}}_1)$ is respectively