Question

Torque on a current carrying rectangular coil inside a galvanometer is maximum and constant irrespective of its orientation as it is suspended inside _________ magnetic field.

Answer 1

Torque on a current carrying rectangular coil inside a galvanometer is maximum and constant irrespective of its orientation as it is suspended inside RADIAL magnetic field.

• A galvanometer contains horseshoe shaped magnet that provides a radial magnetic field.

• So, whenever current flows through the rectangular coil in the galvanometer, the angle between magnetic moment and magnetic field vector is always 90°.

• So, $\boxed{\tau = MB\sin(\theta)}$

• Hence, the torque is always maximum and doesn't vary with different angles of the coil.

Hope It Helps.