Is it compulsory that non-contact forces are having both the properties, i.e., attraction and repulsion?

Which of the following force is utilized in reducing air pollution by removing dust, soot and fly-ash particles from the smoke coming out of chimneys of factories ?

Electric force attracts tiny bits of paper. Explain by an activity and write your observations.

Two thermocol balls held close to each other but move away from each other, when they are released, name the force which might be responsible for this phenomenon. Explain.

Explain the situation when does the repulsion occur for two charges.

Which force is responsible for raising our body hair when we try to take off a terylene or polyester shirt in the dry weather?

When a plastic pen is rubbed in dry hair, it attracts tiny pieces of paper. Which force is involved in this process?

Is it compulsory that non-contact forces are having both the properties, i.e., attraction and repulsion?

During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is

Explain and demonstrate the effect of electrostatic force.

An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?