A copper wire of radius 0.65 mm is insulated with a sheathing of thickness 1.25 mm having a thermal conductivity of 0.7 W/mK. The outside surface convective heat transfer coefficient is 10 W/m2K. If the thickness of insulation sheathing is raised by 15 mm, then what will be the result on electrical current-carrying capacity of the wire?
1
It will increase
2
It will decrease
3
It will remain same
4
It will vary depending upon the electrical conductivity of the wire