The current through a galvanometer reduces to 25% of its orginal value when a shunt is connected. The resistance of the shunt is 25 ohm. Find the resistance of the galvanometer.

The current through a Galvanometer reduces to 20% of its original value when a shunt is connected. The resistance of the galvanometer coil is 100 Ohm. Then the value of the shunt in Ohms is

The deflection of a galvanometer falls to 20 divisions from 50 divisions when a resistance coil of 12 ohm is connected across the galvanometer coil. The resistance of the galvanometer coil in ohms is