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QJEEM19Ph928d: JEE Main 2019 Physics - Class 11 JEEM19Ph928d Solution: A solid sphere of mass 'M' and radius 'a' is surrounded by 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 :

Multiple Choice Options

  • A GM3a2
  • B 2GM9a2
  • C GM9a2
  • D 2GM3a2

Step-by-Step Verified Solution

We use Gauss’s Law for gravitation

g.4πr2 = (Mass enclosed) 4πG

g=3M4πG4π(3a)2=GM3a2

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