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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 cell in the circuit is balanced at 1.25m. If a voltmeter is connected across the same cell , it reads 0.65V.The error in the volt meter is

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a

0.05V

b

0.5V

c

0.025V

d

0.25V

answer is B.

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Detailed Solution

detailed_solution_thumbnail

From potentiometer expl

e1e2=l1l2;1.5e2=31.25⇒32e2=31.25 ∴ e2=1.252=0.625V  Error =0.65−0.625=0.025V

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