Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m¬¨‚â§ .k), when the insulation thickness is __________ mm.$

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of

1.	Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m¬¨‚â§ .k), when the insulation thickness is __________ mm.$
A.	15
B.	25
C.	10
D.	30
Answer» C. 10