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Question: Two cells when connected in series are balanced on 8m on a potentiometer. If the cells are connected...

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

A

3:53 : 5

B

5:35 : 3

C

3:43 : 4

D

4:34 : 3

Answer

5:35 : 3

Explanation

Solution

E1E2=l1+l2l1−l2=(8+2)(8−2)=53\frac { E _ { 1 } } { E _ { 2 } } = \frac { l _ { 1 } + l _ { 2 } } { l _ { 1 } - l _ { 2 } } = \frac { ( 8 + 2 ) } { ( 8 - 2 ) } = \frac { 5 } { 3 }