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A 3-mm-diameter and 5-m-long electric wire is tightly wrapped with a plastic cover whose thermal conductivity is k=0.15Wm1K1. Electrical measurements indicate that a current of 10A passes through the wire, and there is a voltage drop of 8V along the 5 -m-long wire. If the insulated wire is exposed to a medium at T=30 degree C with a heat transfer coefficient of h=12Wm2K1, determine the temperature at the wire-plastic interface in steady state for four different plastic cover thicknesses: 5, 10, 15, and 20mm