Acurrent of 200 a is passed through a stainless-steel wire [k = 19 w/m · ◦c] 3 mm in diameter.
the resistivity of the steel may be taken as 70 μ\omega · cm, and the length of the wire is 1 m. the
wire is submerged in a liquid at 110 ◦c and experiences a convection heat-transfer coefficient of
4kw/m2 · ◦c.
a) if the current changes from 200 a to 300 a, what will the temperature be at the center?
b) with a current of 300 a, what is the temperature 0.5 mm from the outer surface of the wire?
c) what is the maximum current of the wire? [take melting point of stainless steel as 1363 ◦c]