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Question

In an experiment for calibration of voltmeter, a standard cell of emf 1.5V is balanced at 375cm length of potentiometer wire. The potential difference across a resistance in the circuit is balanced at 1.25 m. If a voltmeter is connected across the same resistance, it reads 0.6V. The error in the voltmeter is

A
0.1V
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B
0.025V
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C
0.235V
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D
0.18V
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Solution

The correct option is A 0.1V
iρ=El=1.53.75VmV1=(iρ)l=1.53.75×1.25V1=0.5VError=VV1=0.60.5=0.1V

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