The initial temperatures of two bodies A and B were T1 and T2 respectively. When they are brought in contact the heat flows from body B to body A. The heat flow stops when temperature of bodies A and B reaches T3 and T4 respectively, then which of the following is true?

T2>T1; T3=T4

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T2>T1; T3>T4

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T2<T1; T3=T4

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T2<T1; T3<T4

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Solution

The correct option is A T2>T1; T3=T4
When two bodies are brought in contact with each other, the heat always flows from the body at higher temperature to the body at lower temperature. In this case, since heat flows from B to A, the temperature of B (T2) is more than temperature of A (T1).
Also, the heat flow stops when both the bodies reach the same temperature.
Therefore,
T2>T1; T3=T4

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