# a thin metallic spherical shell contains a charge Q on it. a point charge  q is placed at de centre of de shell and another charge q" is placed outside it. all de 3 charges r +ve.wat is de force on de charge at de centre?wat is de force on de central charge due to de shell ?

420 Points
12 years ago

Dear Nandan

This is the concept of electrostatic shielding. Electric field lines can not penetrate the mettalic shell and net force on charge q is zero.

Force on q due to q" will be towards left and for the net force to be zero the force by shell will be towards left but magnitude can not be calculated as distances are not given.

All the best.

AKASH GOYAL

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509 Points
12 years ago

force on the charge at cetrer = force bw shell & charge + force bw charge & charge

electric field inside a spherical shell is 0 , so F = qE = 0

force due to shell on charge at center is 0 ...

net force = force bw two charges = kq2/r2

force due to shel = 0

mathew jacob
16 Points
12 years ago

force is 0

as the resultant force exp by q due to the shell is 0 as electric feild due to the shell is 0 inside the shell

now due to electrostatic sheilding of the shell electric feild due to q'' is sheilded and hence the force on q due to q'' is also 0

thank you

Krish Gupta
3 years ago
This is a very trivial question and asked by

Hello Nandan,

This is the concept of electrostatic shielding. Electric field lines can not penetrate the mettalic shell and net force on charge q is zero.

Force on q due to q" will be towards left and for the net force to be zero the force by shell will be towards left but magnitude can not be calculated as distances are not given.

All the best.

Krish Gupta

Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation.

Hope it clears the doubt and I hope it gets approval.

ankit singh