Physics
Conductors and Insulators
Practice questions
In an earthed conductor near a positively charged rod in which direction can electrons move?In an earthed conductor near a negatively charged rod in which direction can electrons move?Why is earthing removed first and the charged object removed later in charging by induction?What can happen if the external charged object is removed first while earthing remains during induction charging?Why can attraction appear in a polarised insulator even though net charge does not change?Which statement is most correct when comparing induction in a conductor and polarisation in an insulator?Why does charge produced by rubbing on an insulator not spread uniformly over the entire surface?If charge is localized on an insulator, how can the electric field around it be?Why is it wrong to treat an insulator as equipotential like a conductor?Why is it difficult to retain static charge on a metal object held by hand?In which condition can static charge remain on a metal object for a longer time?Why can final charge become equal when two identical metal spheres are brought into contact?Why may charge not divide equally between two unequal conductors in contact?The electric field inside a conductor is zero. Does this prove that there is no charge on the conductor?If volume charge density inside a conductor is zero in electrostatic equilibrium, where will excess charge be?From the energy point of view, what do free charges do while a conductor reaches electrostatic equilibrium?Which statement about electric-field energy inside a closed conductor is correct when the electric field inside is zero?Why does a closed metal cage protect its interior from an external electrostatic field?A person inside a car gets relative protection during lightning due to which principle?Why is a lightning-protection rod made of metal and connected to earth?