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A wire has resistance 12 ohms. It is bent in the form of a circle. The effective resistance between the two points on any diameter of the circle is,

a) 12 ohms
b) 24 ohms
c) 6 ohms
d) 3 ohms


By taking any diameter, the circumference would become half. As a result each half would have a resistance of 6Ω that are connected in parallel. So effective resistance would be 3Ω.
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