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Physics

Conductors and Insulators

Practice questions

When an isolated conductor is given excess charge, why does the charge reside on its outer surface in electrostatic equilibrium?Why does an excess charge remain localized near the place where it is deposited on an insulator?Why is the tangential component of the electric field at the surface of a conductor in electrostatic equilibrium zero?Why can a metal be electrically neutral in its normal state even though it contains free electrons?What is the benefit of placing a charged metal sphere on an insulating stand in an experiment?If a positively charged object is brought near an isolated neutral conductor, which charge is induced on the nearer end of the conductor?If a negatively charged object is brought near a neutral conductor, where do electrons move?Why is it not necessary to touch the charged object to the conductor during charging by induction?What is the main difference between charging by contact and charging by induction?What happens during polarisation when an insulator is placed in an external electric field?Which is the correct comparative description of electrostatic induction in a conductor and polarisation in an insulator?Why is an object inside a closed metal enclosure protected from an external electrostatic field?Why is the net electric field inside a conductor zero in electrostatic equilibrium?Why is the surface charge density higher at a pointed part of a conductor in electrostatic equilibrium?Why is the electric field relatively strong just outside a pointed metal tip?A closed metal enclosure is used to protect sensitive equipment from an external electrostatic field. At electrostatic equilibrium, what is the electric field inside the enclosure due to external sources?What happens when a charged conductor is connected to the Earth by a conducting wire?An isolated conductor initially has a potential difference between two points within its conducting material. What will its free charges do as electrostatic equilibrium is established?Why is a conductor called an equipotential body in electrostatic equilibrium?Why is it not proper to treat an insulator as equipotential like a metal?