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Q.27. A wire of resistance R is bent in form of a closed circle, what is the resistance across adiameter of the circle?28 Acharge of oir maud |
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Answer» As we can see the points A and B divides the circle in two equal arcs hence if we flow a current from point A to B it will pass from AOB and ACB where O and B are points on two arcs therefore the connection will look like this i.e parallel that is parallel connection hence effective or net resistance between any two point will be 1/Rn = 1/r0 + 1/r1 1/R/2 + 1/R/2 = 2/R+ 2/R = 1/Rn 4/R = 1/Rn =R/4 |
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