Physicshard · Past Paper
What is the equivalent resistance of a wire of 12 Ohms bent into a circle, measured across its diameter?
A12 Ohms
B6 Ohms
C3 Ohms
D24 Ohms
✓ Correct Answer: C — 3 Ohms
The circle is split into two 6 Ohm arcs in parallel. R_eq = (6*6)/(6+6) = 36/12 = 3 Ohms.
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