A sphere of mass M has gravitational field at point P is g1. Now volume cavity of radius R is removed as shown. New gravitational field is g2. Find $\left({g_1\over g_2}\right)$?
(1) $41\over50$
(2) $50\over41$
(3) $41\over42$
(4) $40\over41$
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Ans : (2) 50/41
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