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The balancing length for a cell is 560 cm in a potentiometer experiment. When an external resistance of 10Ω is connected in parallel to the cell, the balancing length changes by 60 cm. If the internal resistance of the cell is N10Ω , where N is an integer then value of N is ______

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Detailed Solution

Let the emf of cell is E internal resistance is 'r' and potential gradient is x.Only cell connected l1= 560cm;E∝l1⇒E=Kl1⇒E=560K l2= 560-60=500cm; When resistance is connected to cell then V=Kl2 r=EV-1R=l1l2-1R=560500-110=560-50050010=1210 ∴n=12

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