Question

A wire of resistivity 10 ohm is bent and in the form of closed circle what is the effecting resistance between two points at the end of any diameter

Answer 1

Hi..

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 parallel connection
i.e..
    Re=(1/5+1/5)^(-1)      which we will get in substiting the parallel resistence formula 
when we equate it we'll get 2.5 ohm



Hope this helps u!!