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30 In a potentiometer of 10 wires the balance point for measuring the emf of...

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30 In a potentiometer of 10 wires the balance point for measuring the emf of a cell is obtained on 6th wire To shift the balance point on 8th wire we should 1 Decrease resistance in series with the cell whose emf is to be measured 2 Increase resistance in series with the cell whose emf is to be measured 3 Decrease resistance in main circuit in series with potentiometer battery 4 Increase resistance in main circuit in series with battery

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