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JEE Main20199 Apr 2019Morning ShiftPhysicsGravitationActual

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

Options

  1. AG M 9 a 2
  2. BG M 3 a 2
  3. C2 G M 3 a 2
  4. D2 G M 9 a 2

Correct answer

B. G M 3 a 2

Step-by-step solution

Gravitational field at point P , = GM 3 a 2 + G 2 M 3 a 2 = GM 9 a 2 + 2 GM 9 a 2 = GM 3 a 2

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