Answers

2015-05-26T18:23:18+05:30
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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