Can you solve 18th q:

18. In Fig. 3.188. ABCDA is a uniform circular wire of  resistance 2 Ω . AOC and BOD are two wires along two perpendicular diameters of the circle, each having same resistance 1
Ω . A battery of emf  ξ  and internal resistance r is connected between point A and D. calculate the equivalent resistance of the network. ]

A n s .   15 14 Ω


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