1
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Question

# A current of 10−3 A is flowing in a resistance of 1000Ω. To measure potential difference accurately, a voltmeter should be used, which has resistance of

A
0 Ω
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B
500 Ω
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C
1000 Ω
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D
>>1000 Ω
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Solution

## The correct option is D >>1000 Ωif voltmeter's resistance is comparable or lesser than 1000Ω then the potential difference shown by voltmeter will not be the actual potential difference across the resistor.This is because significant part of current which is flowing through the resistor will go in the branch containing the voltmeter if, the resistance of the voltmeter is not very high than 1000Ω.Therefore, option(D)

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