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A solid sphere of mass 'M' and radius 'a' is surrounded by a uniform concentric spherical shell of thickness and mass respectively. The gravitational field at distance from the centre should be equal to:
(a)
(b)
(c)
(d)

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Important Questions on Gravitation
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Consider two solid spheres of radii , and masses and respectively. The gravitational field due to sphere and are shown. The value of is:

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From a solid sphere of mass and radius a spherical portion of radius is removed as shown in the figure. Taking gravitational potential at the potential at the centre of the cavity thus formed is (gravitational constant)

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A spherically symmetric gravitational system of particles has mass density where, is a constant. A test mass can undergo circular motion under the influence of the gravitational field of particles. Its speed as a function of distance from the centre of the system is represented by

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