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In the arrangement shown in the figure when the switch is open, the galvanometer shows no deflection for l = L/2. When the switch is closed, the galvanometer shows no deflection for l = . The internal resistance (r) of 6 V cell, and the emf E of the other battery are respectively
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Correct option is B
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In the network shown, when switch S is open balancing length AN1 = 60 cm and when the switch S is closed, balancing length AN2 = 50 cm. then the value of r is
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