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Choose correct alternative. emf of a c...

Choose correct alternative.
emf of a cell is 2.2 volt. When resistance `R = 5 Omega` is connected in series potential drop across the cell becomes 1.8 volt. Value of internal resistance of the cell is

A

`7//2`

B

`9//10`

C

`10//9`

D

`12//7`

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