A.Both bodies must be solids
B.Both bodies must be in contact
C.Temperatures of the two bodies must be different
D.One of the bodies must have internal source of heat generation
E.All of the above
A.Both bodies must be solids
B.Both bodies must be in contact
C.Temperatures of the two bodies must be different
D.One of the bodies must have internal source of heat generation
E.All of the above