An iron ball at 35°C is dropped in a mug containing water at 35°C. Choose the correct one.

Iron ball temperature will decrease

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Heat flow will take place

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No heat will flow

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Water temperature will increase

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Solution

The correct option is C No heat will flow
Heat always flows due to temperature difference and flows from a body at high temperature to a body at low temperature.
In this case, the heat will not flow from iron ball to water or from water to iron ball because both of them are at the same temperature of 35°C.

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