JEE Advanced 2018 Physics question

A moving coil galvanometer has 50 turns and each turn has an area . The magnetic field produced by the magnet inside the galvanometer is 0.02 . The torsional constant of the suspension wire is . When a current flows through the galvanometer, a full scale deflection occurs if the coil rotates by 0.2 . The resistance of the coil of the galvanometer is 50 . This galvanometer is to be converted into an ammeter capable of measuring current in the range . For this purpose, a shunt resistance is to be added in parallel to the galvanometer. The value of this shunt resistance, in *ohms*, is .