First slide
Gravitational field intensity

A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as (0r)


F=0 when 0rR1
because intensity is zero inside the cavity.
F increase when R1rR2
F1r2 when r>R2

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