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

$\left(Ans.\frac{15}{14}\Omega \right)$

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