Question

a wire having a resistance of 10 omg is bent to form a circle . what is the effective resistance between the two points along the any diameter of the circle
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Answer 1

Explanation:

A 10 ohms resistance when bent into the circle. The two points on the diameter will change it into 2 resistances of 5 ohms each, these both r will be in the parallel order. Hence the total resistance between these points will be 2.5 ohms 1/r=1/r1+ 1/r2

=1/5 +1/5

=2/5 ohms

So, final r=2.5 ohms.