In the Permanent Magnet Moving Coil (PMMC) instruments, damping is provided by

The coil spring attached to the moving coil

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The aluminium frame to the moving coil

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Damping vane in the air tight chamber

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Eddy current disk

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Solution

The correct option is B The aluminium frame to the moving coil
The movement induces emf and hence current in the aluminium frame of the coil. The torque developed due to this current is the damping torque.

Suggest Corrections

List - I	List - II
(i) a pair of springs	(p) to provide controlling torque
(ii) aluminimum former	(q) to provide damping torque
	(r) to act as a base for the coil
	(s) to provide current into and out of the moving coil