question

a spherical conducting shell of inner radius  and outer radius  has a charge q.

(a) a charge q is placed at the centre of the shell. find out the surface charge density on the inner and outer surfaces of the shell.
(b) is the electric field inside a cavity (with no charge) zero; independent of the fact whether the shell is spherical or not? explain.

 

 

 

 

 

 

 

440