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The emf of cell is balanced by balancin...

The emf of cell is balanced by balancing length 450 cm . When the resistance of `10 Omega` is connected across the cell, balancing length changes by 100 cm. The internal resistance of a cell is

A

`1.8Omega`

B

`2.8Omega`

C

`3.8Omega`

D

`2.5Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
`r_(1)=((l_(1)-l_(2))/(l_(2)))R=(450-350)/(350)xx10=(1000)/(350)`
`=2.8 Omega`
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