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A sphere is released on a smooth inclined plane from the top. When it moves down its angular momentum is

$\begin{array}{1 1} a) \text{conserved about every point} \\ \text{b) conserved about the point of contact only} \\ \text{c) conserved about the centre of sphere only} \\ \text{d) conserved about any point on a fixed line parallel to the ibclined plane and passing through the centre of the ball.} \end{array}$

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The only external force is $mg\; \sin \theta$ acting through the centre.
answered Dec 6, 2013 by meena.p

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