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Damping torque is essential to

Damping torque is essential to Correct Answer Reduce oscillation

The deflecting torque is used for deflection, the controlling torque acts opposite to the deflecting torque. So before coming to rest the pointer always oscillates due to inertia, so to bring the pointer rest within a short time by reducing oscillations, we use damping torque without effecting controlling torque (or) inertia.

The following mechanism can be used for producing damping torque.

1. Air friction damping

2. Fluid friction damping

3. Eddy current damping

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