A wire of length 1 m and radius 10 3 m is carrying a heavy

Last updated: 6/6/2023

A wire of length 1 m and radius 10 3 m is carrying a heavy current and is assumed to radiate as a black body At equilibrium its temperature is 900 K while that of the surroundings is 300 K The resistivity of the material of the wire at 300 K is x10 8 m and its temperature coefficient of resistance is 7 8x10 3 per C Stefan s constant 5 68x10 8 W m K4 So the current in the wire is 310 1 25 A 3 21 A 2 15 A 4 36 A