Sarthaks Test
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A mass m is placed at P a distance h along the normal through the centre O of a thin circular ring of mass M and radius r (Fig. 8.3).If the mass is removed further away such that OP becomes 2h, by what factor the force of gravitation will decrease, if h = r ?

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Only the horizontal component (i.e. along the line joining m and O) will survive. The horizontal component of the force on any point on the ring changes by a factor:

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