A cell of emf epsilon and internal resis...

A cell of emf `epsilon` and internal resistance r gives a current of 0.5 A with an external resistance of `12 Omega `and a current of 0.25 A with an external resistance of `25 Omega.` Calculate (b) emf of the cell.

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MODERN PUBLICATION-ELECTRIC CURRENT. RESISTANCE AND E.M.F-EXERCISE

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