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Compare moving coil and moving iron instruments.
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S.No
M.C Instruments
M.I Instruments
1 More accurate
Less accurate 
2 Uniform scale
Non-uniform scale (scale cramped at beginning and finishing)
3 Eddy current damping is used 
Air friction damping is used
4 Controlling torque is provided by spring
Controlling torque is provided by gravity or spring

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