Two very large parallel sheets a distance d apart have their centers directly opposite each other. the sheets carry equal but opposite uniform surface charge densities. a point charge that is placed near the middle of the sheets a distance d/2 from each of them feels an electrical force f due to the sheets. if this charge is now moved closer to one of the sheets so that it is a distance d/4 from that sheet, what force will feel?

(a) f
(b) 4f
(c) 2f
(d) f/2
(e) f/4

Option (A) is the correct answer.

Explanation:

According to the Gauss law, electric field due to very large sheet of charge is as follows.

                    E =

where,     = charge per unit area

Since, it is given that there are two sheets of equal and opposite charge. Therefore, electric field between the plates will be as follows.

                  E =

Also, we know that relation between force and electric field is as follows.

                       F = qE

Hence, force felt by the charge present inside the plates will be as follows.

                    F =

This shows that force is not dependent on the distance and the charge is kept from one of the plate. Therefore, we can say that the force F felt by the charge is same when it is placed at a distance and at a distance from one of the plate.

Thus, we can conclude that the force we will feel is F.

The orbital diagram represents the filling of electrons in the sub levels of an orbit. The filling of the orbitals in sub- levels follow some basic rules and principles.

The orbital diagram of an orbit containing 16 electrons will be as follows:

    1s²2s²2p⁶3s²3p⁴

The maximum number of electrons in each sublevel of the orbitals are:                  2 electrons for s-sublevel with one orbital                  6 electrons for p-sublevel with three orbital                  10 electrons for d-sublevel with five orbital                  14 electrons for f-sublevel with seven orbital