Q.1. What is the importance of radial magnetic field in a moving coil gqlvanometer ?

Ans – 1. The plane of the coil remains parallel to the direction of magnetic field. So, the galvanometer is linear.

2. it is a stronger magnetic field as compared to the magnetic field produced by theflat pieces of a field magnet.

Q.2. Write two differences between electromagnet and permanent magnet.

Ans- The difference between electromagnet and permanent magnet.

Electromagnet:-

1. It is shows temporary magnetism.It produces the magnetic field as long as currents flows in its coil.

2. The polarity of a electromagnetic can be changed by reversing the direction of the current.

Permanent magnet:-

1. It shows permanent magnetism that is it retain magnetism in it even when the current is swiched off.

2. The polarity of a permanent magnet cannot be changed.