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## Homework Statement

Two cells of same emf E and different internal resistance r1 and r2 are connected in series to an external resistance R.The value of R for which the potential difference across the first cell is zero is given by

(A) R=r1/r2

(B)R=r1+r2

(C)R=r1-r2

(D)R=r1r2

## Homework Equations

E=IR[/B]

## The Attempt at a Solution

I first founded the total current in the circuit which came to be-E/R+r1+r2 then used the equation Ir1 to get the potential difference but I am not getting my answer[/B]