Physics
Conductors and Insulators
Practice questions
In electrostatic equilibrium, why does excess charge given to a metal sphere reside on its outer surface rather than within the sphere?Why can charge placed on dry rubber remain near the same location?In electrostatic equilibrium, in which direction is the electric field just outside the surface of a conductor?In which type of material is electrostatic induction observed most clearly because charge carriers are free to move?Why does electric current flow easily through a metal wire?In which type of material is the flow of electric current difficult because there are very few free charge carriers?In electrostatic equilibrium, the electric field inside a connected conductor is zero. What is the potential inside the conductor?What can happen when a charged metal sphere is connected to the Earth?Why is the outer covering of electric wires made of insulating material?In which situation does charge separation by electrostatic induction occur in an isolated, initially neutral conductor?What occurs during electric polarisation in an insulator?Why is copper suitable for electrical wires?If a tangential component of electric field exists on the surface of a conductor, what will happen?A person inside a metal car body gets protection during lightning due to which principle?Why is the surface charge density higher at the sharp tip of a conductor in electrostatic equilibrium?Why is a lightning conductor connected to the earth?If excess charge given to a material redistributes easily through it, what is the material generally called?If excess charge placed on a solid material remains localized near the point of deposition instead of spreading throughout the material, what type of material is it generally?Why is a metal spoon different from a rubber spoon in terms of electrical conductivity?Why can charge be exchanged when a conductor is connected to the Earth?