Explain with neat sketch; the construction and working principle of Repulsion type moving iron instrument.

Explain with neat sketch; the construction and working principle of Repulsion type moving iron instrument.
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1 Answer

Answer :

Repulsion Type Moving Iron Instrument:

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Construction: It consist of fixed cylinder hollow coil which carries operating current inside the coil there are two soft iron pieces. One of which is fixed other is movable. The fixed iron piece is attached to the coil whereas the movable iron piece is attached to the pointer. 

Under the action of deflecting torque the pointer attached to the moving system moves over the scale. The controlling torque is provided by spring control and damping torque is provided by air friction.

Working Principle: When two iron pieces are magnetized with same polarity a repulsive force act on them and moving iron piece gets deflected. 

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