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In the potentiometer circuit shown in th...

In the potentiometer circuit shown in the figure the balance length AJ=60cm when switch S is open. When switch S is closed and the value of R=`5Omega`, the b alance length AJ=50cm. The internal resistance of the cell C' is

A

`1.2Omega`

B

`1.0Omega`

C

`0.8Omega`

D

`0.6Omega`

Text Solution

Verified by Experts

The correct Answer is:
2
Here `I_(1)=60cmI_(2)=50cm,R=5Omega`
`e=kl_(1)`
where k is the potential gradient ac ross the wire
`V=kl_(2)`
`therefore epsilon_(V)=(I_(1))/(I_(2))=(60)/(50)=(6)/(5)`
Internal resistance of the cell is
`r=((epsilon)/(V)-1)R=(( 6)/(5)-1)=1.0Omega`
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