Physics · 2014
JEE Main · 12 April 2014, Shift 1 · Q30
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…
In the experiment of calibration of voltmeter, a standard cell of e.m.f. $\displaystyle 1.1$ volt is balanced against $\displaystyle 440$ cm of potentiometer wire. The potential difference across the ends of resistance is found to balance against $\displaystyle 220$ cm of the wire. The corresponding reading of voltmeter is $\displaystyle 0.5$ volt. The error in the reading of voltmeter will be :
Official answer
(4)
-$\displaystyle 0.05$ volt
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JEE Main 2014 Physics question, with the answer from NTA’s final answer key. Where our answers come from.