Question: An a.c. voltmeter with a maximum scale reading of 50-V has a resistance of 500 Ohm and an inducts of 0.09 henry. The magnetising coil

An a.c. voltmeter with a maximum scale reading of 50-V has a resistance of 500 Ohm and an inducts of 0.09 henry. The magnetising coil is wound with 50 turns of copper wire and the remainder of the circuit non-inductive resistance in series with it. What additional apparatus is needed to make this instrument correctly on both d.c. circuits or frequency 60?

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