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Ball pen and fountain pen depend respectively upon the principle of
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The interface of two liquids of densities & respectively lies at the point A in a light U tube at rest. The height of liquid column above A is , where . The cross-sectional area of the tube is S. With what angular velocity it must be whirled about a vertical axis at a distance 'a' such that the interface of the liquid shifts towards B by .
| Question Text | Ball pen and fountain pen depend respectively upon the principle of |
