Physics
Conductors and Insulators
Practice questions
If the same metal rod is held using an insulating handle, why can charge remain on it for a longer time?Why are sensitive devices kept inside a closed conducting enclosure for electrostatic shielding?In electrostatic equilibrium, excess charge spreads over the surface of a conductor, whereas charge in an insulator generally remains localized. What best explains this difference?Attraction is possible when a charged rod is brought near an insulator because what can happen at the nearer part?Why can a metal mesh reduce the effect of an external electrostatic field in the region inside it?For a conductor in electrostatic equilibrium in vacuum, if the local surface charge density increases, what happens to the magnitude of the electric field just outside the surface?Why must the earth connection be removed before removing the charged inducing body during charging by induction?An initially neutral, isolated conductor is brought near a charged rod, but it is neither touched nor grounded. Which statement about the conductor’s net charge is correct?In electrostatic equilibrium, what does a non-zero normal component of the electric field just outside a conductor surface indicate?Can an isolated conductor remain electrically neutral overall even when positive and negative induced charges are separated over different parts of its surface?In electrostatic equilibrium, what is the value of the electric-field energy density within the material of an ideal conductor?Extra charge is placed on a small region of a neutral solid insulator. What is the most likely result because its charge carriers are bound?Why can wet wood be more electrically conductive than dry wood?If the potential is different at different points inside a conductor, what will happen?In electrostatic equilibrium, why is the electric field due to an external static charge zero inside the empty cavity of a closed conducting vessel?In electrostatic equilibrium, at which part of an irregularly shaped charged conductor is the surface charge density greatest?After being charged, when a conductor reaches electrostatic equilibrium and becomes equipotential, what does it mean?A metal casing of an electrical appliance may acquire charge due to leakage. What is the correct purpose of earthing it?Two isolated conducting spheres have radii \(R_1\) and \(R_2\). They are far apart and are connected by a thin conducting wire. If the system has a non-zero total charge, what is the ratio of charges \(q_1\) and \(q_2\) on the spheres at electrostatic equilibrium?If two identical isolated metal spheres carrying a total charge are brought into contact and allowed to reach electrostatic equilibrium, why is the final charge on each sphere equal?