^Circuit to compare emf of two cells

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Circuit to compare emf of two cells

When S & S1 closed let the balancing length is b1, ξ1 ∝ b1.

When S & S2 closed let the balancing length is b2, ξ2 ∝ b2. Dividing above two relations we get

 

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^At balanced state ^Circuit to find ‘r’ of a cell
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