13 2 In a potentiometer setup when a secondary cell emf 2 V is balanced...

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13 2 In a potentiometer setup when a secondary cell emf 2 V is balanced balance length of 10 cm obtained If another secondary cell of emf 4 V connected in series with initial secondary cell same polarity the new balance length will be 1 10 cm 2 20 cm 3 30 cm

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