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Question

A potentiometer is an ideal device of measuring potential difference because

A
It uses a sensitive galvanometer
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B
It is an elaborate arrangement
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C
It has a long wire hence heat developed is quickly radiated
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D
It does not disturb the potential difference it measures
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Solution

The correct option is D It does not disturb the potential difference it measures
In balance condition, potentiometer does not take the current from secondary circuit.

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