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=l2l1−1=l2−l1l1 ∴E1E2=l1l2−l1=280480−280=280200 E1:E2=7:5