Question

Why does a car always attract dust right after it is polished? (Note that car wax and car tires are insulators.)

A) Polishing generates excess charge on the car and thus attracts dust particles by polarizing them.

B) Polishing will neutralize the car surface and thus attract the dust particles by polarizing them.

C) Polishing will neutralize the car surface and thus attract the neutral dust particles.

D) Polishing will generate excess charge on the car and thus attract the neutral dust particles.

Answer 1

As we know that charging can be done by three ways:-

Induction, Rubbing, conduction .

Here, polishing the car means rubbing the car so it will generate charge on the car. This charge will attract the dust particles, this is done by polarizing the dust particles. Polarization means separating or shifting of positive and negative charges.

Hence dust particles are attracted and they stick to the car.

So the correct answer according to above explanation is

(A)Polishing generates excess charge on the car and thus attracts dust particles by polarizing them