Question

A wire of resistance 4ohm is bent to form a circle.what is the resistance between two diametrically opposite ends?

Answer 1

R= 4 ohm
let diameter be AB
now, resistance of upper part and lower part will be 2 ohm each
The resistance will be parallel

So,
R1=R2=2R.... see in pic

Resistance between 2 diametrically apposite ends is R ohms





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