Question

dont copy paste
Describe the working principle of a moving coil galvanometer. Why is it

necessary to use (i) a radial magnetic field and (ii) a cylindrical soft iron core

in a galvanometer? Write the expression for current sensitivity of the

galvanometer.

Answer 1

Galvanometer works on the principle of conversion of electrical energy into mechanical energy. When a current flows in a magnetic field it experiences a magnetic torque. If it is free to rotate under a controlling torque, it rotates through an angle proportional to the current flowing through it.