Question

5 resistors form like a circle each of 5 ohm placed on a circle
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Answer 1

Explanation:

The diametrically opposite points divides the resistance into half of the total resistance. 

Resistance of each semi circle   R1=R2=25=2.5 Ω

These resistance are connected in parallel.

So, equivalent resistance   Req=R1+R2R1R2=2.5+2.52.5×2.5=1.25Ω