Question

on which principal galvonometeris based​

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.

Answer 2

Galvanometer works on the principle of conversion of electrical energy into mechanical energy.

:)