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Braking system consists of _________

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Braking system consists of _________

(a) bar magnet

(b) temporary magnet

(c) permanent magnet

(d) super magnet

The question was asked by my school principal while I was bunking the class.

I want to ask this question from Induction Type Single Phase Energy Meter in chapter Measurement of Power and Related Parameters of Electrical Measurements

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Correct choice is (c) permanent magnet

The best I can explain: In an induction type single phase energy meter, edge of the aluminium disc consists of a permanent magnet also known as a brake magnet. E.m.f is induced in the aluminium disc when it rotates as a result of the magnetic field produced by the brake magnet.

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