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In the experiment of calibration of volt...

In the experiment of calibration of voltmeter, a standard
cell of emf `11 V` is balanced against `440 cm` of
potentiometer wire. The potentail difference across the
ends of a resistance is found to balance aginst `220 cm` of the wire. The corresponding reading of the voltmeter is `0.5 V`. Find theerror in the reading of voltmeter.

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