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Can we decrease or increase the range of...

Can we decrease or increase the range of the given voltmeter?

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We can increase the range of the given voltmeter by putting a suitable high resistance in series with the voltmeter.
We can decrease the range of the given voltmeter by putting a suitable resistance in parallel with the high resistance already in series with the galvanometer working as voltmeter, so that the effective resistance of the voltmeter multiplied with the current `(I_g)` gives the required potential difference to be measured now.
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