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The scale of a voltmeter is uniform. Its type is _________

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The scale of a voltmeter is uniform. Its type is _________

(a) Moving Iron

(b) Induction

(c) Moving coil permanent magnet

(d) Moving coil dynamometer

This question was addressed to me in an international level competition.

The above asked question is from The Rectifier Voltmeter in chapter Application of Diodes of Electronic Devices & Circuits

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Right answer is (c) Moving coil permanent magnet

Easy explanation: Moving coil permanent magnet instruments have permanent magnets. It is suited for DC measurement because here deflection is proportional to the voltage because resistance is constant for a material of the meter and hence if voltage polarity is reversed, deflection of the pointer will also be reversed so it is used only for DC measurement.

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