A sphere is released on a smooth inclined plane from the top. when it moves down, its angular momentum is
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a
conserved about every point
b
conserved about the point of contact only
c
conserved about the centre of the sphere only
d
conserved about any point on a line parallel to the inclined plane and passing through the centre of the ball
answer is D.
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Detailed Solution
As the inclined plane is smooth, the sphere can never roll, rather it will just slip down. Hence, the angular momentum remains conserved about any point on a line parallel to the inclined plane and passes through the centre of the ball.