Physics
Conductors and Insulators
Practice questions
If charge is localized on an insulator, what type of electric-field distribution is likely near it?Treating an insulator as equipotential like a conductor is based on which wrong assumption?Why does a metal rod held by hand fail to retain static charge when rubbed, while a plastic rod can retain it?Why is a metal object kept on an insulating stand to retain static charge for a longer time?What condition allows charge to divide equally when two identical metal spheres are brought into contact?What is the correct reason charge may not divide equally when two unequal conductors touch?The electric field inside a conductor is zero. Which wrong conclusion should not be drawn from this?Why is excess volume charge density zero inside a conductor and charge present on the surface in electrostatic equilibrium?When does rearrangement of free charges in a conductor stop?If the electric field inside a closed conductor is zero, what is the conclusion about electric-field energy inside?Why can the effect of an external electrostatic field be reduced on a person inside a metal cage?What is the correct scientific basis of protection inside a car during lightning?Why is it necessary for a lightning protection rod to be connected to earth?The advantage of a pointed lightning rod is most related to which effect?Why may a locally charged insulator not fully discharge instantly when only one point is earthed?What change occurs in molecules of an insulator placed in an external electric field?What mainly contributes to the attraction of small paper pieces by a charged comb?How can local positive and negative regions form on a conductor with zero net charge?In which arrangement will a sensitive device be best protected from an external electrostatic field?Which is the complete identity of electrostatic equilibrium for a conductor?