A thin hollow disc has mass M, inner radius R and outer radius 2R. P is a point on its axis at a distance 2R from centre O. Then the intersity of gravitational field at point P is
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Solution
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At the surface of spehere apply superposition :-
E=GM(2R)2−GM/8R2 (cut out part would've mass M/8 as its volume is V/8 of complete sphere)