A particle of mass m is at a distance of 4R from the centre O of a solid sphere of mass 4m and radius R. A is a point on the surface of the sphere as shown in the figure. Then intensity of gravitational field at A is
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A particle of mass m is at a distance of 4R from the centre O of a solid sphere of mass 4m and radius R. A is a point on the surface of the sphere as shown in the figure. Then intensity of gravitational field at A is