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Question

A Leclanche cell gets balanced on the wire of potentiometer at 280 cm. If a Daniel cell is joined in series with Leclanche cell, then the balance point is obtained at 480 cm. Compare the e.m.f. of two cells.

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Solution

Given: E1=ρl1
E1+E2=ρl2
Formula used for solution
E1E2=l1l2
E1+E2E1=ρl2ρl1=l2l1
1+E2E1=l2l1
E2E1=l2l11=l2l1l1
E1E2=l1l2l1=280480280=280200
E1:E2=7:5

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