A potential difference across the terminals of a battery is 50 V when 11 A current is drawn and 60 V ,when 1 Acurrent is drawn. The emf and the internal resistance of the battery are

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For a closed circuit cell supplies a constant current in the circuit. For cell E = V + Ir For V = 50 V E = 50 + 11 r Similarly, for V = 60 V E = 60 + r From eqs. (i) and (ii), we get E = 61 V

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