Physics
Conductors and Insulators
Practice questions
In which situation can an insulator be attracted even without current flow?In electrostatic equilibrium, what does a zero electric field inside a conductor imply about its free charges?Why is an insulator such as plastic mainly used as the outer safety covering of electrical wires?Why are copper and rubber used together in an electric wire?If a closed metal cage is placed in an external electric field, why can the field inside be reduced?If excess charge remains inside a conductor, why will it not be considered electrostatic equilibrium?Why is the electric field just outside the surface of a charged conductor perpendicular to the surface in electrostatic equilibrium?Under which condition can a charged conductor be rapidly discharged by connecting it to Earth?If an insulator acquires charge by rubbing, why does the charge not spread over its entire surface as it can in a conductor?Which of the following situations is a correct example of charging by contact?Which of the following procedures is a correct example of charging by induction?If a conductor has zero net charge but a positive effect on one side and a negative effect on the other, what does it indicate?Why does wearing rubber gloves while working on electrical equipment reduce the risk of electric shock?What is the main reason a copper conductor in a household electric wire is covered with plastic insulation?Which statement is correct for an isolated solid conductor in electrostatic equilibrium?Which statement correctly describes the electrostatic behaviour of an insulator?Which structural property chiefly causes the difference in electrical conductivity between a conductor and an insulator?Studying conductors and insulators clarifies which broad idea about electric charges?If a nonzero electric field exists within the conducting material of a conductor, what does it imply?The zero tangential electric field on a conductor surface is most directly related to which fact?