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Q 7 75 In the circuit shown the potentiometer wire PQ has length 120 cm...

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Q 7 75 In the circuit shown the potentiometer wire PQ has length 120 cm and total resistance 10 22 The main cell E has emf 24 V and internal resistance 222 The jockey J is moved on the potentiometer wire PQ to find the balancing point If the current through the galvanometer is zero for the length PJ 70 cm the emf of the cell E is P E E 11 7 V 12 4 V 12 9 V G Q

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