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Q.39.A wire of resistance R bent in form of closed circle, what is the resistance across diameter of thecircle.

Answer»

Given, resistance of wire is R

when, it is bend in a form of circle then the resistance across its diameter is ---

1/R' = 1/R/2 + 1/R/2

=> 1/R' = 2/R + 2/R

=> 1/R' = 4/R

=> R' = R/4

hence, the resistance across the diameter of circle is R/4.



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