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in Magnetic Effects of Electric Current by (57.3k points)

The necessary current for full scale deflection is 0.2 mA for any galvanometer of resistance 12 Ω. How will you convert it to a voltmeter of range 0 to 18 V?

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Resistance of coil G = 12 Ω
Range of desired voltmeter V = 19 V
Deflecting current for full scale Ig = 2 mA
To convert galvanometer into an voltmeter, a high resistance is to be added in series.

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