Comparison between MC and MI Instruments

S.No	M.C Instruments	M.I Instruments
1	More accurate	Less accurate
2	Costly	cheap
3	Uniform scale	Non-uniform scale (scale cramped at beginning and finishing)
4	Very sensitive	Robust in construction
5	Low power consumption	Slightly high power consumption
6	Eddy current damping is used	Air friction damping is used
7	Can be used only for D.C	Can be used on A.C as well as on D.C
8	Controlling torque is provided by spring	Controlling torque is provided by gravity or spring
9	θ α I	θ α I²
10	Errors are set due to aging of control springs, permanent magnet (i.e. No Hysteresis loss)	Errors are set due to hysteresis and stray fields (i.e. hysteresis loss takes place).

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