Question

prove that the current through galvanometer is directly propotional to the angle of twist?

Answer 1

Answer:

The rotation of the coil twists the suspension fibre which exerts a restoring torque on the coil. The restoring torque is Ce, where 0 is the ang of twist and C is the torque constant (torque per unit angle of twist). ... Thus, the current through the coil is directly proportional to the deflection of the coil.