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Question
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 cell reversed, they balance on 2 m. The ratio of e.m.f's of the two cells is ____________.
Options
3 : 5
5 : 3
3 : 4
4 : 3
MCQ
Fill in the Blanks
Solution
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 cell reversed, they balance on 2 m. The ratio of e.m.f's of the two cells is 5 : 3.
Explanation:
`"E"_1/"E"_2 = (l_1 + l_2)/(l_1 - l_2)`
` = ((8 + 2))/((8 - 2))`
` = 5/3`
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