In a moving coil galvanometer, torque is controlled by a ___________.
Complete the sentence with the correct option.

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Torsion constant

Magnetic field

Force

Counter torque

answer is D.

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Detailed Solution

A moving coil galvanometer is a device that is used to measure and detect a small amount of electric charge. It is based on the fact that when a current-carrying rectangular coil is placed in a magnetic field it experiences a torque.

The magnetic torque NIAB tends to rotate the coil of the galvanometer. Spring provides a counter torque $k φ$ that balances the magnetic torque NIAB; resulting in a steady angular deflection $φ$

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