Two copper wires of the same length have diameters in the ratio
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
Two copper wires of the same length have diameters in the ratio 1:2. When they are connected in parallel, their equivalent resistance is 3Ω. What is the resistance of the thicker wire when used alone?
(a) 4.5Ω
(b) 3.75Ω
(c) 2.4Ω
(d) 15Ω