To convert a galvanometer into a voltmeter, you have to

Change the dial markings on the galvanometer

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Decrease its overall resistance

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Increase its overall resistance

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Use better batteries on it

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Solution

The correct option is C Increase its overall resistance
How do you drop a larger potential across a galvanometer? Increase its overall resistance. And how do you do that? You know when we connect two resistors in series, their overall resistance is greater than the sum of each resistance. So that’s what we do. We connect a high resistance in series and allow a larger drop across it. Now the needle can indicate voltage drop.

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