The operation of moving iron meter is based on-
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A.
Heating effect
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B.
Electro-static effect
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C.
Electro-magnetic effect
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D.
Induction effect
Correct Answer:
C. Electro-magnetic effect
Explanation:
The operation of a moving iron meter relies on the electromagnetic effect, where a piece of soft iron is attracted or repelled by the magnetic field produced by a current-carrying coil. When current flows through the stationary coil, it generates a magnetic flux that acts upon the movable iron vane, creating a torque that moves the pointer across the scale. This mechanism allows the instrument to measure both direct current (DC) and alternating current (AC).
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