Question

An iron ball at ${40}^{o}C$ is dropped in a mug containing water at ${40}^o$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 correct option is B not flow from iron ball to water or from water to iron ball.

Given: Temperature of iron ball= ${40}^{0}C$

Temperature of water in mug = ${40}^{0}C$

Solution: As the iron ball and the water in the mug has the same temperature, so there will be no heat flow from ball to the water or vice versa.

As, heat flow is the result of the temperature difference.

Hence the correct option is (B).