Question

A wire of resistance 5 ohm is bent in the form of a closed circuit.what is the resistance at the end of any diameter of this circuit?

Answer 1

Resistance of each half circle will be 5/2 =2.5 ohm

Resistance between two diametrically opposite end, the wire will be in parallel connection.

(1/R) = (1/2.5) +(1/2.5)
         =2/2.5
⇒R = 2.5/2
⇒R= 1.25 ohm