Question

Question 9
An iron ball at ${40}^{\circ }C$ is dropped in a mug containing water at ${40}^{\circ }C$. The heat will

(a) flow from iron ball to water.
(b) not flow from iron ball to water or from water to iron ball.
(c) flow from water to iron ball.
(d) increase the temperature of both.

Answer 1

The answer is (b) not flow from iron ball to water or from water to iron ball.

The heat transfer occurs only if there is a temperature difference. Here, the iron ball and water is at the same temperature, hence there won't be any transfer of heat.