The net resistance of a voltmeter should be large to ensure that
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a
it does not get overheated
b
it draws excessive current
c
it can measure large potential difference
d
it does not appreciably change the potential difference to be measured
answer is D.
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Detailed Solution
The resistance of voltmeter is too high, so that it draws negligible current from the circuit, hence does not change the potential drop to be measured.