In an experiment for calibration of voltmeter, a standard cell of emf 1.5V is ba

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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

Options:

A . 0.1V

B . 0.025V

C . 0.235V

D . 0.18V

Answer: Option A
:
A

i ρ = \frac{E}{l} = \frac{1.5}{3.75} \frac{V}{m} V^{1} = (i ρ) l = \frac{1.5}{3.75} \times 1.25 V^{1} = 0.5 V E r r o r = V - V^{1} = 0.6 - 0.5 = 0.1 V

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