Object a is placed on top of object b. object a is the same temperature as object b. how will heat flow between object a and object b?
a. heat will flow from object a to object b.
b. no heat will flow between object a and object b.
c. heat will flow from object b to object a.

B.No heat will flow between object A and object B.

Explanation:

As we know that heat will flow due to temperature gradient so in all cases the flow of thermal energy is from high temperature to low temperature

So whenever thermal energy is transferred then it has tendency to make the two objects into thermal equilibrium

At the condition of thermal equilibrium the net flow of heat from one object to other object is always zero

So here when object A is placed on the top of object B then in that case it is given that the temperature of two objects are same here.

So these objects are already in thermal equilibrium so there is no net heat flow.

so correct answer will be

B.No heat will flow between object A and object B.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this