Answers

2016-02-17T09:06:54+05:30
2.5ohm

when the wire is made into a circle and when 2 points int he ends of the diameter are considered then the resistor willget split up into 2
resitors each of 5 ohms and these 2 resistors will be in \\ connection
i.e..
    Re=(1/5+1/5)^(-1)      which we will get in substiting the \\ resistence formula 
when we equate it we'll get 2.5 ohm
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2016-02-17T19:10:01+05:30
The length of the wire between two points at the end of a diameter will be half of the complete circular wire.  Resistance of wire between two points  = 10/2 = 5  The two sections is R eq, we have  1/Req = 1/5 + 1/5 = 2/5  Req = 2.5

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