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Q.

Two cells when connected in series are balanced on 8 m on a potentiometer. If the cells are connected with polarities of one of the cells is reversed, they balance on 2 m. The ratio of e.m.f.'s of the two cells is

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a

3 : 5

b

5 : 3

c

3 : 4

d

4 : 3

answer is B.

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Detailed Solution

E1E2 =  l1 + l2l1 − l2  =   8+28−2=  53
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