Discussion
Which of the following parts in the PMMC instrument is responsible for damping?
Answer: C
In a PMMC instrument the moving coil is wound on an aluminium former. When the coil moves in the magnetic field, eddy currents are induced in the former, and these produce a force that opposes the motion, which damps the movement of the pointer so it settles quickly. The spring gives the controlling torque, the spindle carries the pointer and the moving coil gives the deflecting torque. The answer is aluminium former, option (C).
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