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In the calibration of ammeter experiment...

In the calibration of ammeter experiment, a standard cell of e.m.f. 1.1 volt gets balanced at 7.70m of potentiometer wire. If the potential difference across `1Omega` resistance gets balanced at 1,75m, then the current indicated by ammeter is 2/10A. The error in the reading of ammeter

A

0.05 A

B

`-0.05 A`

C

zero

D

0.01 A

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