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Q.

In an experiment for calibration of voltmeter, a standard cell of emf 1.5V is balanced at 300cm length of potentiometer wire. The P.D.across a resistance in the circuit is balanced at 1.25m. If a voltmeter is connected across the same resistance, it reads 0.65V. The error in the volt meter is

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a

0.05V

b

0.025V

c

0.5V

d

0.25V

answer is B.

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Detailed Solution

300x10-3m→1.5V ; 1.25m→?V = 0.625V ; Error in ammeter reading= 0.625 - 0.65 = 0.025v .
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In an experiment for calibration of voltmeter, a standard cell of emf 1.5V is balanced at 300cm length of potentiometer wire. The P.D.across a resistance in the circuit is balanced at 1.25m. If a voltmeter is connected across the same resistance, it reads 0.65V. The error in the volt meter is