Objective question in Electric Current

For a cell, the terminal potential difference is 2.2 V when the circuit is open and reduces to 1.8 V, when the cell is connected across a resistance, R = 5W. The internal resistance of the cell is a) frac{{10}}{9}Omega b) frac{9}{{10}}Omega c) frac{{11}}{9}Omega d) frac{5}{9},Omega

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