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In the experiment of calibration of volt...

In the experiment of calibration of voltmeter, a standard cell of e.m.f. 1.1 Volt is balanced against 440 cm of potentiometer wire. The potential 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. The error in the reading of voltmeter will be

A

`-0.15`volt

B

0.15 volt

C

0.5 volt

D

`-0.05` volt

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