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ConceptCells, Emf, Internal Resistance

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#### Question

A cell of emf '*E*' and internal resistance '*r*' is connected across a variable load resistor R. Draw the plots of the terminal voltage *V* versus (i) *R* and (ii) the current *I*.

It is found that when *R* = 4 Ω, the current is 1 A and when R is increased to 9 Ω, the current reduces to 0.5 A. Find the values of the emf *E* and internal resistance r.

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