explain how a moving-coil galvanometer is converted into a voltmeter. Derive the necessary formula.
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Galvanometer cannot measure high potential difference. To make it capable of doing so i.e. to convert a Galvanometer into voltmeter, a very high resistance is connected in series with the galvanometer. Let resistance of galvanometer be G and resistance R is connected in series to it. Then combined resistance = (G + R).
Explanation:
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