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in Optics by (41.0k points)
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Two cells of same emf but different internal resistances r1 and r2 are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is

(A) r2 - r1

(B) r1 - r2

(C) r1 

(D) r2

1 Answer

+1 vote
by (44.5k points)
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Best answer

Correct option  is (A) r2 - r1

Comparing values of I from (i) and (ii)

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