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With a potentiometer null point were obt...

With a potentiometer null point were obtained at 140 cm and 180 cm with cells of emf 1.1 V and one unknown `chi` volts. Unknown emf is

A

1.1 V

B

1.8 V

C

2.4 V

D

1.41 V

Text Solution

Verified by Experts

The correct Answer is:
D
`E_(1)/E_(2) = l_(1)/l_(2) rArr 1.1/X = 140/180 rArr X = (18 xx 1.1)/14`
`rArr X = 1.41 V`
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