The magnitude of the electrostatic force between two identical ions that are separated by a distance of 5.0 x10^−10 m is 9.20 x 10^−10 n.
(a) what is the charge (in coulombs) of each ion?

To solve this problem, we apply the concepts related to the electrostatic force proposed by Coulomb's law. This force can be expressed as

Here

k = Coulomb's constant

= Charge of each object

d = Distance between objects

We have that the charge are the same, and the distance and the force are

Replacing we have,

Solving for q,

Therefore the charge of each ion is

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.