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Questions  

Thirteen resistances, each of resistance R ohm, are connected in the circuit as shown in figure. The effective resistance between A and B is 

 

a
4R3Ω
b
2RΩ
c
d
2R3Ω

detailed solution

Correct option is D

The given circuit may be reduced to⇒ RAB = 4R3×4R34R3+4R3 = 2R3

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