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 then

• A. heat flows from C to A
• B. heat flows from A to C
• C. no heat flows between A and C

Answer 1

The correct option is A heat flows from C to A

We know that heat flows from a hot body to cold body.

- 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 from C to A.