A 3 -mm-diameter and 5m-long electric wire is tightly wrapped with a 2mm thick plastic cover whose thermal conductivity is k=0.15W/mC. Electrical measurements indicate that a current of 10A passes through the wire and there is a voltage drop of 8V along the wire. If the insulated wire is exposed to a medium at Tn=30C with a heat transter coefficient of h=12W2mC Page 2 of 3 (a)-Calculate the heat generated in the wire (electrical power) (b)-Determine the temperature T1 at the interface of the wire and plastic cover in steady state operation. (c)- (c-1) Determine the critical radius of the wire. (c-2) If doubling the thickness of plastic cover the temperature of the interface (wire-plastic) will increase or decrease