In a moving coil galvanometer, the coil is suspended in a radial magnetic field in order to-

The correct answer is option 2) i.e. increase the accuracy of the galvanometer

CONCEPT:

• Moving coil galvanometer:  It is an electromagnetic instrument to measure electric current.
  • ​The working principle of a moving coil galvanometer - A current-carrying coil when placed in an external magnetic field experiences a torque.
  • A coil of many turns is suspended between the poles and pieces of a magnet.
  • The pole pieces of the magnet are concave in shape to produce a radial magnetic field. 
  • The deflection of the coil due to the torque is the measure of the current in the coil.

EXPLANATION:

• The radial magnetic field is uniform and ensures that the plane of the coil is parallel to the magnetic field in all directions of the coil.
• This helps in providing a uniform torque on the coil. 
• The uniform torque help in the proper deflection of the coil and hence increases the accuracy of the galvanometer.​

Additional Information

• The sensitivity of the galvanometer can be increased by increasing the number of turns of the coil, using strong magnets or increasing the area of the coil.
•  The magnetic field strength inside a galvanometer is increased by placing a soft iron core inside.