A Metal Bar Is Used to Conduct Heat

Multiple Choice

A metal bar is used to conduct heat.When the temperature at one end is 100°C and at the other is 20°C,heat is transferred at a rate of 16 J/s.If the temperature of the hotter end is reduced to 60°C,what will be the rate of heat transfer?

A) 4 J/s
B) 8 J/s
C) 9 J/s
D) 12 J/s