Question

In a moving coil galvanometer, how is magnetic field made radial?

Answer 1

In a moving coil galvanometer, the magnetic field is made radial using two specific design features:

1. Concave Magnetic Poles: The pole pieces of the permanent magnet are curved (cylindrical) rather than flat.
2. Soft Iron Core: A soft iron cylinder is placed in the centre of the coil. Because soft iron has high magnetic permeability, it “pulls” the magnetic field lines toward its centre.