Physics
Conductors and Insulators
Practice questions
What is the main physical reason for keeping the tip of a lightning rod sharp?If an insulator has localized charge, why may touching one point to Earth fail to discharge the whole object immediately?If an insulator is placed in an external electric field, what microscopic change can occur inside it?A charged comb attracts small pieces of paper. What is the correct physical reason?If a conductor has zero net charge but local positive and negative regions on its surface, how should this be understood?If a conductor has zero field inside but field exists outside which statement is most correct?In which situation will a sensitive device inside a conductor be most protected from external electrostatic effect?Which statement gives the complete identity of electrostatic equilibrium for a conductor?Which statement gives a deeper identity of electrical behaviour of an insulator?What is the most fundamental physical basis of the difference between conductor and insulator?If a material has very few free charge carriers what behaviour is more likely in electrostatics?What broad conclusion comes from advanced study of conductors and insulators?What is the most correct reason for zero electric field inside a conductor in electrostatic equilibrium?Why will electrostatic equilibrium not exist if a potential difference remains inside a conductor?Why does excess charge given to a conductor remain on the outer surface?A negative charge is placed inside a closed cavity of a neutral conductor. What will be the total induced charge on the inner surface?If a negative charge is placed in the cavity of a neutral conductor, what will be the total charge on the outer surface?If a positive charge is inside a cavity and the conductor is earthed, which statement about total charge on the outer surface is correct?What will happen if a component of electric field parallel to the surface of a conductor exists?What is the direction of electric field just outside a conductor surface?