GATE Electrical Engineering (EE) 2019 Solved Paper

Question : 53 of 65

Marks: +1, -0

A moving coil instrument having a resistance of

10 Ω

, gives a full-scale deflection when the current is

10 {mA}

. What should be the value of the series resistance, so that it can be used as a voltmeter for measuring potential difference up to

100 {V}

Solution:

{R}_{ {sc}}= {R}_{ {m}}[\;{ {V}}/{ {V}_{ {m}}}-1]

\;\; =10[\;{100}/{0.1}-1]

\;\; 10[999]

=9990 Ω

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