The electrical resistance of a copper rod is 15 x 10-6 ohm m-1 (Ώ ). It conducts a current of 900 A and has a radius of 1 cm (r1). It is insulated to a thickness of 5 mm (t1) using a material having a thermal conductivity of 0.05 W/m K (K1) and then further covered to a thickness of (t2) 1.8 cm with plastic material of thermal conductivity (K2) 0.5 W/mK. This plastic outer layer is exposed to air at 30oC (To) and the convective heat transfer coefficient is 15W/m2 K (h). Determine the outer surface temperature of the plastic insulation.
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this is too tuff!!! sorry I can't do this
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