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Physics

Conductors and Insulators

Practice questions

Why cannot electrostatic equilibrium persist if a tangential component of electric field exists at the surface of a conductor?Why is Earth called a large charge reservoir in the context of earthing?What is the main reason for placing a metal sphere on an insulating rod?In which arrangement is a metal rod most likely to retain charge for the longest time after rubbing?When does the potential of an initially charged, isolated conductor become equal to the potential of the Earth?If charge density is higher at a pointed conductor, how can the electric field nearby be?Why must a lightning conductor be connected to the earth?Why does an electric wire have a metal conductor inside and a plastic covering outside?How does a vehicle with a closed metal body primarily protect a person inside during lightning?If a negatively charged object is brought near a neutral conductor, what induced charge appears at the nearer end of the conductor?If a positively charged object is brought near a neutral conductor, what happens at the nearer end of the conductor?Why can wet wood have higher electrical conductivity than dry wood?Which statement about a conductor in electrostatic equilibrium is correct?If the same amount of charge is placed on the surface of an isolated metal conductor and an insulator, which statement is correct?In electrostatic equilibrium, must the surface charge density be the same at every point on a charged conductor?Why is electric discharge more likely near a sharp tip of a charged conductor?A completely enclosed cavity inside a conductor contains no charge, and the conductor is in electrostatic equilibrium. If an external electrostatic field is applied outside the conductor, what is the electric field inside the cavity?Why are sensitive electrical devices placed inside a closed metal enclosure?Which sequence correctly charges an initially neutral metal sphere permanently by induction?Why is it not necessary to touch a charged object to a metal conductor while charging it by induction?