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In an experiment of calibartion of voltmeter, a standard cell of emf `1.1 V` is balanced against `440 cm` of potentiometer wire. The potentilal difference across the ends of a resistance is found to balance against `220 cm` of the wire. The corresponding reading of voltmeter is 0.5 volt. Find the error in the reading of voltmeter.

A

-0.15 volt

B

0.15 volt

C

0.5 volt

D

-0.05 volt

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