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 ?

Sir,how q" exert force on q 2wards left as electric field lines from q" do not enter de shell? also why de shell exert force on charge q as electric field inside shell is zero ?

pur-new-sol