A vessel containing water is heated from the top by means of a heater, just above the water surface. Assume that the temperature of the water was just above \(0^\circ\text{C},\) in the beginning. The temperature \((\theta_A)\) at the bottom is measured as a function of time. Which of the following shows the correct plot?

1. \(a\) 2. \(b\)
3. \(c\) 4. \(d\)
Subtopic:  Convection |
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