100 cm of potentiometer wire balance the e.m.f of a cell and 75 cm wire required for balance the terminal voltageof the cell, when it is shunted by 6 ohm
resistor. The internal resistance of the cell is
(1) 2 Ω
(2) 4 Ω
(3) Zero
(4) 8 Ω
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the internal resistance of the cell is 2ohm
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