In the existence of an electric field, the free electrons start drifting ,thus creating an opposition field, which keeps growing as more electrons start drifting. When this opposition field becomes equal to the original field, electrons stop drifting, and we have achieved steady state, and there is no electric field inside the conductor. Will this happen always? Consider a point charge placed at the center of a metallic shell. We can draw a Gaussian surface enclosing the charge, and thus, the field inside cannot be zero.
1.Why did the mechanism i mentioned earlier not work here?
2.When exactly then, can we say that there exists no field inside the conductor? Or is it that no field exists in the inside of the conductor due to external charges?.