What is the function of

(i) Uniform radial field

(ii) Soft iron core

i n such a device?(moving coil galvanometer)

Hi Bijay!

(i)  The uniform radial magnetic field keeps the plane of the coil always parallel to the direction of the magnetic field. That is, the angle between the plane of the coil and the magnetic field is zero in all the orientations of the coil.

(ii)  The soft iron core increases the strength of the magnetic field.

Cheers!!