Physics
Conductors and Insulators
Practice questions
The magnitude of electric field just outside a conductor surface depends on which local quantity?What is the main reason for stronger electric field near a pointed conductor?Why is electric discharge more likely at a sharp metal tip?Why is charge distribution considered uniform on an isolated spherical conductor?Why can the earlier uniform charge distribution change when an external charge is placed near a spherical conductor?What effects appear at the near and far ends of a neutral conductor placed near a positively charged rod?What effects appear at the near and far ends of a neutral conductor placed near a negatively charged rod?If a charged rod is brought near a conductor but there is neither contact nor earthing, what will happen to the net charge?What is the most important role of earthing in actual charging by induction?How can electrons move in an earthed conductor near a positively charged rod?How can electrons move in an earthed conductor near a negatively charged rod?Why is the correct sequence necessary in charging by induction?What can happen if the external charged object is removed first while earthing remains connected during induction charging?Why can attraction occur in a polarised insulator even though net charge does not change?Which is the most correct comparison between induction in a conductor and polarisation in an insulator?Why does charge produced by rubbing on an insulator not spread uniformly over the whole 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?