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In a experiment for calibration of voltm...

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

A

0.5 V

B

0.025 V

C

0.05 V

D

0.25 V

Text Solution

Verified by Experts

The correct Answer is:
B
`(V_(1))/(V_(2))=(l_(1))/(l_(2))impliesV_(2)=0.625V`
Error `=0.65-0.635`
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