A metal rod 6 mm in diameter and 1 m long runs between two large bus bars. The rod is insulated on its lateral surface against the flow of heat and electric current. The bus bars are at 20°C. What is...

A metal rod 6 mm in diameter and 1 m long runs between two large bus bars. The rod is insulated on its lateral surface against the flow of heat and electric current. The bus bars are at 20°C. What is the maximum current, the rod can carry if its temperature is not to exceed 150°C at any point? Assume resistivity of rod material is 1.7 × 10^–6
Ω cm and thermal conductivity is 300 W/m.K.