A copper-silver bimetallic wire, 1 cm in diameter, is prepared by co-extrusion with copper as the core and silver as the outer layer. The desired properties along the axis parallel to the length of the bimetallic wire are as follows:
(a) Thermal conductivity > 410 W/(m ˆ™ K);
(b) Electrical conductivity > 60 × 106 „¦-1m-1; and
(c) Weight Determine the allowed range of the diameter of the copper core.

Copper Silver 8.96 Density (g/em3) Electrical conductivity (-1 m-1) 59x10 63x10 Thermal conductivity W( K)] 401 429 10.49