Four wires AB, BC, CD and DA of resistance 4 Ω each and fifth wire BD of resistance 8 Ω are joined to form a rectangle AB CD of which BD is diagonal. The effective resistance between the points A and B [Fig] is

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24 Ω

16 Ω

4/3 Ω

8/3Ω

answer is D.

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Detailed Solution

See fig .

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