Physics
Conductors and Insulators
Practice questions
A neutral, isolated conductor is brought near a positively charged rod, but it neither touches the rod nor is grounded. After charges redistribute due to induction, what is the net charge on the conductor?Which sequence correctly charges an initially neutral conductor permanently by induction?In a rubber-insulated electric wire, which properties respectively justify the use of a metal core and a rubber covering?Why are rubber gloves safer than metal gloves during electrical work?Under normal conditions, air is an insulator, but why can it become conducting during lightning?Two identical metal spheres, isolated from external influences, are brought into contact, allowed to reach electrostatic equilibrium, and then separated. Which statement is correct?In electrostatic equilibrium, the net electric field within a conducting material is zero. What is the net electric force on a charge \(q\) placed within the conducting material?If the electric field inside a conductor is zero, what will the potential difference inside be?Why is a neutral insulator attracted when a charged object is brought near it?An uncharged metal sphere is brought near a positively charged rod without touching it. What happens in the sphere?When a conductor is connected to the Earth, its potential tends to become equal to whose potential?Why can the net charge on a charged metal object decrease when it is touched by hand?Why does the distribution of charge on a conductor in electrostatic equilibrium depend on the shape of the object?In electrostatic equilibrium, can the surface charge density on an irregularly shaped charged conductor be different at different points on its surface?An isolated conductor is placed in an external electrostatic field. Which statement is correct after electrostatic equilibrium is established?If the electric field inside a conductor is not zero, why is electrostatic equilibrium not possible?If a conductor has been given charge and is in electrostatic equilibrium, what is the potential at all points within its conducting material?When a conductor and an insulator are placed in an external electric field, which statement correctly distinguishes their behaviour?Which option shows the correct application of a conductor?Which material arrangement is most suitable for a connecting wire in a household electrical appliance to allow current to flow while protecting the user from electric shock?