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Most Important Selected Qs for JEE AdvancedPhysicsElectrostatics

A thin-walled, spherical conducting shell S of radius R is given charge Q . The same amount of charge is also placed at its centre C . Which of the following statement(s) are correct?

Options

  1. AOn the outer surface of S , the charge density is Q 2 R^2 .
  2. BThe electric field is zero at all points inside S .
  3. CAt a point just outside S , the electric field is double the field at a point just inside S .
  4. DAt any point inside S , the electric field is inversely proportional to the square of its distance from centre

Correct answer

D. At any point inside S , the electric field is inversely proportional to the square of its distance from centre

Step-by-step solution

-Q charge must be induced on the inner surface of the shell. Hence +2 Q charge appears on its outer surface.

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