A wire of resistance 4r is bent in the form of a circle . What is the effective resistance between the ends of the diameter
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The 4R gets equally divided into 4 parts of 1R. Of which, 2 each are in series and the resultant of these form a parallel connection. Therefore
Equivalent resistance is (1+1)(1+1)/(1+1)+(1+1)= 4/4 =1R
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