When a stopper is pulled from a filled wash basin, the water drains out while circulating like a small whirl pool. The angular velocity of a fluid element about a vetical axis through the orifice appears to be greater near the orifice. The angular velocity of fluid element varies
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a
inversely as the square of its distance from the axis through the orifice.
b
inversely as the distance from the axis through the orifice.
c
directly as the square of its distance from the axis through the orifice
d
directly as the distance from the axis through the orifice