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A wire of resistance 10 ohm is bent in the form of circle. what is the effective resistance between the two points at the ends of any diameter of the



Resistance is proportional to the length of the wire L
when the wire is bent to form circle  the upper half  &  lower half of the wire has length L/2 so resistance of the upper half  &  lower half of the wire = 10/2 = 5Ω
so when connected in the given manner the effective resistance of the wire will b as if 2 wires of resistance 5Ω r in parallel 
so effective resistance of the wire will b 5/2 = 2.5 Ω
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