Temperature of A is `100^(@)C` and that of B is 250 K. When they are kept in contact, heat

Options

A. flows from B to A
B. flows from A to B
C. flows from B to A only if B is bigger in size
D. flows from B to A only if A is bigger in size

Answer

To solve the problem, we need to determine the direction of heat flow between two bodies A and B based on their temperatures.

### Step-by-Step Solution:

1. **Identify the Temperatures**:
- Temperature of A, \( T_A = 100^\circ C \)
- Temperature of B, \( T_B = 250 \, K \)

2. **Convert Temperature of A to Kelvin**:
- To compare the temperatures, we need to convert the temperature of A from Celsius to Kelvin.
- The conversion formula is:
\[ T(K) = T(°C) + 273 \]
- Applying this to A:
\[ T_A = 100 + 273 = 373 \, K \]

3. **Compare the Temperatures**:
- Now we have:
- \( T_A = 373 \, K \)
- \( T_B = 250 \, K \)
- Since \( T_A > T_B \), we can conclude that the temperature of A is higher than that of B.

4. **Determine the Direction of Heat Flow**:
- According to the second law of thermodynamics, heat flows from a body at a higher temperature to a body at a lower temperature.
- Therefore, heat will flow from A to B.

5. **Conclusion**:
- The heat will flow from body A (373 K) to body B (250 K).

### Final Answer:
Heat flows from A to B.

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