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A wire of resistance 8R is bent in the f...

A wire of resistance 8R is bent in the form of a circle. What is the effective resistance between the ends of a diameter AB ?

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Total resistance of wire bent in the form of a circle = 8R
Resistance of each half ACB or ADB =`(8R)/(2) = 4R`
The two half lengths are connected in parallel across AB
`R_(eff) = (4R xx 4R)/(4R + 4R) = 2R`
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