Physics
Conductors and Insulators
Practice questions
What is the correct reason electric discharge is more likely at a sharp metal tip?What is the main reason charge spreads uniformly on an isolated spherical conductor?Why can the earlier uniform charge distribution change when an external charge is brought near a spherical conductor?What effects appear at the near and far ends when a positively charged rod is kept near a neutral conductor?What effect appears at the near end when a negatively charged rod is brought close to a neutral conductor?If a charged object is only brought near a conductor, with neither contact nor earthing, what happens to the conductor's net charge?What is the main function of earthing in actual charging by induction?For an earthed conductor near a positively charged rod, in which direction can electrons move?For an earthed conductor near a negatively charged rod, in which direction can electrons move?Why must the earth connection be removed first in charging by induction?What can happen if the external charged object is removed first while earthing remains connected during induction charging?The potential of an earthed conductor tends to become equal to what?Why is attraction possible in a polarised insulator even though its net charge does not change?What is the most accurate difference 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 near it be?What is the basic error in treating an insulator as equipotential like a conductor?Why is it difficult to retain static charge on a metal object held by hand?Which condition is most suitable for retaining static charge on a metal object for a long time?Why can final charge become equal when two identical metal spheres are brought into contact?