I want to do electrostatic shielding but I am not sure if blocking only the line of sight is enough.
Imagine that there is an electrically charged sphere, $1 cm$ in diameter, just sitting stationary in free space. Some distance away, for example, $3cm$ is another sphere with neutral charge that I want to shield from the electric field of the charged sphere.
Is it enough if I put electrostatic shielding: a circular copper plate with $1cm$ diameter between them? Or will the electric field go around the copper that's only blocking the direct line of sight and affect the neutral sphere I want to protect from electric field?