thermal equilibrium

Diagram shows two identical metal disc, M and N which are in contact. The initial temperature of M and N are 60° C and 20 ° C respectively.

Which statement is correct about M and N when the thermal equilibrium is reach?

Rajah menunjukkan dua keping cakera logam yang serupa, M dan N yang bersentuhan. Suhu awal M dan N adalah 60° C  dan 20° C  masing- masing.
Penyataan manakah yang betul mengenai M dan N apabila kesimbangan terma tercapai?





A Temperature of M is higher than N
B Temperature of N is higher than M
C Net rate of heat flow between M and N is not zero
D Net rate of heat flow between M and N is zero