Q 12-04-050JEE MainJEE Main 2026 (24 Jan, Shift 2)Easy
A moving coil galvanometer of resistance $100\Omega$ shows a full scale deflection for a current of 1 mA . The value of resistance required to convert this galvanometer into an ammeter, showing full scale deflection for a current of 5 mA , is ______ $\Omega$
Answer: (A) 25
A shunt $S$ is connected in parallel with the galvanometer:
$$I_gG = (I - I_g)S\Rightarrow S = \frac{I_gG}{I - I_g} = \frac{1\times100}{5 - 1} = 25\ \Omega$$
Solution by Sreeraj P, M.Sc Physics