Two copper wires X and Y, each 3.0 m long, are connected in parallel. Wire X has radius 0.5 mm and wire Y has radius 1.0 mm. The resistivity of copper is 1.7×10−8Ωm. What is the equivalent resistance between their ends?
a) 0.052Ω
b) 0.013Ω
c) 0.081Ω
d) 0.016Ω