Physics
Conductors and Insulators
Practice questions
Why is it difficult to retain static charge on a metal rod when it is rubbed while being held in a bare hand by a person in contact with the Earth?A glass rod can retain charge after rubbing because glass is what type of material?Why is the electric field perpendicular to the surface of a conductor in electrostatic equilibrium?What is the main reason for very little electric charge flow in an insulator?Which material is generally used for the conducting core of an electric wire?In which situation is electrostatic induction observed?Why can there be no tangential electric field at the surface of a conductor in electrostatic equilibrium?If a charged metal sphere is connected to the Earth, what can its excess charge do?Why is a charged conductor equipotential in electrostatic equilibrium?Which property of an insulator makes it useful for electrical safety?What are the main charge carriers of electric current in a metallic conductor?When an insulator is placed in an external electric field, its bound positive and negative charges undergo a slight relative displacement within molecules, but charges do not flow through the material. What is this phenomenon called?What is the main difference between electrostatic induction in a conductor and polarisation in an insulator?In a static condition, the electric field inside a metal becomes zero. Which state does this indicate?Which of the following pairs represents, respectively, a conductor and an insulator?Why is the net electric field zero within the material of a charged conductor in electrostatic equilibrium?On which material does charge mostly remain near the place where it is given?The basic principle of electrostatic shielding is based on which fact?How does a closed, continuous metal enclosure help protect against lightning?Why can a charged metal sphere retain its charge for a longer time when it is held with an insulating rod?