When a charged comb is brought near a small piece of paper, it attracts. Does the paper become charged before being attracted?

A spherical conductor having a charge of 100 muC is brought near another metallic sphere (of mass 36 kg) resting on earth's surface. What minimum distance of separation should be maintained, so as to lift up the metallic sphere with uniform speed. What happens, if the separation is more or less than the calculated value. (Take g =10 ms ^(-2 ) ) .

Can a charged body attract another uncharged body? Explain.

Consider three charged bodies A, B and C. If A and B repel each other and A attracts C, then what is the nature of force between B and C?

The Coulomb force of attraction between two charges separated by a distance is 4N. If a dielectric medium of dielectric constant 2 is kept to fill the space between them, the force of attraction now becomes

Can two balls having same kind of charge on them which attract each other? Explain.