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A cell of e.m.f. 1 V gives a balance poi...

A cell of e.m.f. 1 V gives a balance point at 40 cm length of a potentioeter wire. For another cell, the balance point shifts to 60 cm. Find the e.m.f. of the second cell.

Text Solution

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`E_(1)=1.5` volt `l_(1)=30cm`
`E_(2)`= ? `l_(2)= 50cm`
`(E_(1))/(E_(2))= (l_(1))/(l_(2))`
`rArr (1.5)/(E_(2))= (30)/(50)`
`rArr E_(2)= 2.5` volt
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