Answers

2016-02-19T20:55:00+05:30

When it is bent to form circle.......the ends of diameter seperates the circle into semicircles in such a way that the two semicircles make a parallel connection in the circuit.Also both the semicircles have equal circumference therefore they have equal resistance.We get 4R as the resistances of the semi circles {8R=4R+4R}.

Therefore 1/effective resistence =1/4 + 1/4 =1/2 ===Effective resistance=2R

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