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  4. For the post office box arrangement to determine the value of unknown resistance, the unknown resistance should be connected between

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Q. For the post office box arrangement to determine the value of unknown resistance, the unknown resistance should be connected betweenPhysics Question Image

IIT JEEIIT JEE 2004Current Electricity

Solution:

BC, CD and BA are known resistances. The unknown resistance is connected between A and D.
Hence, the correct option is (c).