Question

The radial magnetic field is used in a suspended coil galvanometer to provide
(A) a uniform torque on the coil
(B) maximum torque on the coil in all positions
(c) a uniform and maximum torque in all positions of the coil
(d) a non uniform torque on the coil

Answer 1

Uniform torque is responsible for uniform magnetic field in galvanometer. Students must know the concept of the galvanometer in order to solve problems based on such concepts.

Complete step by step solution:
The radial magnetic field is applied to a moving coil galvanometer to produce a constant torque on the coil. It is applied to measure the relation between the current and angle which is non – linear such that the current cannot be measured easily. With the help of the radial magnetic field, the angle between the plane of the coil and the magnetic field is maintained zero in all the directions of the coil.

The radial magnetic field is used in a suspended coil galvanometer to provide a uniform torque on the coil because it provides a uniform magnetic field. It ensures that the magnetic field is radial and uniform throughout the area of the coil.

Hence, (A) is the correct option.

Note: Radial component of the magnetic field is used to generate uniform torque to maintain uniformity in a magnetic field. These devices are used in current electricity in order to find out the value of current. Galvanometer detects DC current if we take AC current it fails to record any value. Galvanometer formation is based on the EMI concept.