Question

A wire of resistance 12 ohm is bent in the form of a circular ring. The effective resistance between the two points on any diameter of the circle is:

• A. 24 ohm
• B. 12 ohm
• C. 6 ohm
• D. 3 ohm

Answer 1

The correct option is D 3 ohm

Resistance of wire is 12 ohm. Therefore, resistance of each semicircle = 6 ohm=6Ω
Two resistances are in parallel.

Their equivalent resistance = $\frac{6\times 6}{6+6}=3$ ohm