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The potential difference in open circuit for a cell is 2.2 volts. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell will be 

(1) 1 ohm

(2) 0.2 ohm

(3) 2.5 ohm

(4) 0.4 ohm

PMT