Discussion
A streamline is a line :
Answer: A
A streamline is a line tangent to which is the direction of velocity at every point.
At a given instant, a streamline is drawn so that the velocity vector at each point on it lies along the line. Because the velocity is always along the streamline, there is no flow across it, which is why two streamlines can never cross.
A line drawn normal to the velocity is the opposite of a streamline, it is how equipotential lines lie in potential flow. Dividing the passage into equal parts describes stream tubes of equal discharge, not the definition. The path of a particle is a pathline, which coincides with a streamline only in steady flow.
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