Physics
Conductors and Insulators
Practice questions
Why is charge density not the same everywhere on an irregular conductor?The condition that a conductor is equipotential is most deeply connected with what?If one identical metal sphere is charged and another is neutral why does charge divide when they touch?Why may charge not divide equally when two conductors of unequal sizes are brought into contact?What is the most suitable reason for the electric field becoming strong near a sharp metal tip?If surface charge density on a conductor increases which statement about the field just outside the surface is suitable?If a neutral conductor is earthed while a negatively charged rod is kept nearby where can electrons go?Why can there be an electric field outside the surface even when the field inside a conductor is zero?What basic error is made if an insulator is treated like an equipotential conductor?A charge is placed outside a conductor and the conductor is earthed. The direction of charge flow depends on what?If charge distribution changes on the outer surface of a conductor, which factor can be important?If a conductor is near an external charge but is not earthed, what does not change due to induction?If charge is localized on an insulator, how can the electric field distribution be?A conductor is charged and isolated. In electrostatic equilibrium, what is the combined reason for zero internal field and surface charge?Why is a closed conductor more useful for electrostatic shielding?How is the absence of the effect of an external charge inside a conductor cavity best understood?The deepest electrical difference between a conductor and an insulator is based on what?If charge is localized on an insulator, why can it be difficult to discharge it completely by earthing as one would a conductor?If surface charge density is zero at a point on a charged conductor, what can be said about the normal electric field just outside that point?When polarisation occurs in an insulator, why is attraction usually observed rather than repulsion?