The laminar boundary layer occurs when a cold fluid over a hot plate. In which of the following positions, the temperature gradient assumes zero value?

The laminar boundary layer occurs when a cold fluid over a hot plate. In which of the following positions, the temperature gradient assumes zero value? Correct Answer At top of boundary layer

The value of temperature gradient dT/dy decreases with the distance from plate and at the top of boundary layer it becomes zero as the temperature equals to free stream temperature of the fluid.
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