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A Daniel cell is balanced on 125 cm leng...

A Daniel cell is balanced on `125 cm` length of a potentiometer wire. Now the cells is short-circuited by a resistance `2 ohm` and the balance is obtained at `100 cm`. The internal resistance of the Daniel cell is

A

0.5 ohm

B

1.5 ohm

C

1.25 ohm

D

`4//5` ohm

Text Solution

Verified by Experts

The correct Answer is:
A
`r = R(l_(1)/l_(2)-1) rArr r = 2(125/100 -1)`
`rAr r = 2 xx 0.25 = 0.5 Omega`
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