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NEET 2013 Physics question

PhysicsCurrent ElectricityNEET 2013

The resistances of the four arms , , and in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be -

Answer: (2)

Solution

Check the balance condition: and . The bridge is balanced, so no current flows through the galvanometer and its 50 resistance is irrelevant. The bridge then reduces to two

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Question ID VK-091321