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How can we decrease the voltage between neutral & earthing wire?
Voltage between neutral and earthing is called stray voltage how can we reduce it.

Why the disk of induction type relay is Elliptical and in spiral shape?
Why the disk surface and surrounding area is perforated or dotted or rough?

About electromegnet induction type energy meter

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In electromegnet induction type energy meter why the rotating...

In electromegnet induction type energy meter why the rotating alluminium disk is perforated? Its surface is dotted and rough, why?
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