Question

When two bodies A and B are brought together, heat does not flow between them. When another body C is brought into contact with B, heat starts flowing from C to B. After the heat flow stops, C is now brought into contact with A. Which of the following(s) is/are correct?

(a) No heat flows between A and C
(b) Heat flows from A to C
(c) Heat flows from C to A
(d) A and C are already at thermal equilibrium.​

Answer 1

Answer:

(c) Heat flows from C to A

Explanation:

=> When A and B are brought together, there is no heat flow between them. That means that A and B are in thermal equilibrium.

=> Now when another body C is brought in contact with B, heat flows from C to B. This means C is at a higher temperature than B. Heat flows till the temperatures of B and C are equal. There will be a rise in temperature of B. Thus, B and C will have a temperature higher than that of A.

=> Now when C is brought into contact with A, since C has a higher temperature than A, there will be heat flow C to A.

Hope it is helpful....