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Null point in the galvanometer is obtain...

Null point in the galvanometer is obtained when a cell of emf E and internal resisance r is connncted across the length of 22 cm wire of the potentiometer . Now a resistane of `10Omega` is connected across the terminals of the cell (by closing the key K) and null point is obtained against the length of cm. The internal resistance r of the cell is -

A

`0.5 Omega`

B

`1 Omega`

C

` 1.5 Omega`

D

` 2 Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
`r=((l_(1))/(l_(2))-1)R`
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