A 2.0 mm × 4.0 mm flat carpet acquires a uniformly distributed charge of −10 μC after you and your friends walk across it several times. A 3.0 μg dust particle is suspended in midair just above the center of the carpet.
a. What is the charge on the dust particle?

Explanation:

Let us assume that the carpet is like a large sheet of charge for the dust particle.

Hence, the electric field is as follows.

                E =

Now, the value of will be as follows.

                         =

Now, for the dust particle

                = 0

                          qE = mg

Now, putting the given values into the above formula and calculate the charge as follows.

                qE = mg

           q =

Thus, we can conclude that charge on the dust particle is .

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.