Physicshard · Past Paper
A wire is bent into a circle. What is the equivalent resistance across the diameter if the original wire had resistance R?
AR/2
BR/4
CR/8
DR
✓ Correct Answer: B — R/4
Across the diameter, the circle splits into two semicircles each with resistance R/2. They are in parallel, so (R/2)/2 = R/4.
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