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A cell of e.m.f. 1.2 V is balanced by 15...

A cell of e.m.f. 1.2 V is balanced by 150 cm of potentiometer wire. When the cell is shunted by a resistance of `4 Omega`, the balancing length is reduced by 30 cm. What is the internal resistance of the cell ?

A

`1 Omega`

B

`2 Omega`

C

`0.5 Omega`

D

`0.75 Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
`r= R((l_(1)-l_(2))/(l_(2)))= 4 xx((150-120)/(120))=1 Omega`
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