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Physics

Conductors and Insulators

Practice questions

How can a metal be overall neutral even though it has free electrons inside?When an isolated neutral conductor is brought near a charged object, induced positive and negative charges appear on its opposite sides. If no charge is transferred to or from the conductor, what is its net charge?What is the main difference between charging a conductor by contact and charging it by induction?The electric field inside a conductor is zero. What is the electric force on a free charge placed inside it?If there is a potential difference inside a conductor, what will free charges do?Why can an insulator become charged even though very little sustained current flows through it?What is the main benefit of placing a conductor on an insulating stand?In which situation does a charged conductor lose its charge rapidly?Why are properly voltage-rated, dry, and undamaged rubber gloves safer than metal gloves during electrical work?If the net charge on a conductor is zero, can charge separation by induction still occur?In electrostatic equilibrium, free charges inside a conductor have no net directed drift. What does this imply about the electric field in the interior of the conductor?If two identical metal spheres are brought into contact, how can charge behave?Why can an insulator not generally be treated as equipotential like a metal in electrostatic equilibrium?What phenomenon can occur when an insulator is placed in an external electric field?Which combination is correct for constructing a safe electrical wire that must carry current and also protect the user from electric shock?In electrostatic equilibrium, the electric field in the interior of a conductor is zero. What is the value of the electric-field energy density there?Why can the charge distribution in a conductor depend on the shape of the object?Charge on the outer surface of a charged conductor indicates what?Which main idea in electrostatics is strengthened by studying conductors and insulators?What is the main reason that the electric field inside a conductor is zero in electrostatic equilibrium?