A solid sphere of mass M and radius a is surrounded by a uniform concentric spherical shell of thickness 2 a…

A solid sphere of mass M and radius a is surrounded by a uniform concentric spherical shell of thickness 2a and mass 2M. The gravitational field at distance 3a from the centre will be:
  1. GM9a2
  2. GM3a2
  3. 2GM3a2
  4. 2GM9a2

Solution

Gravitational field at point P,
=GM3a2+G2M3a2
=GM9a2+2GM9a2
=GM3a2

Asked in: JEE Main 2019 (09 Apr Shift 1)

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