Hi, after watching kahn acadamy and lectures, mostly due to being busy, i would like if you could for someone to summarize electrostatics an

Would you like a very brief summary as in just in important bits? Or would you like me to talk about electrostatics and magnetism in general?

I think just the key stuff. I missed some lectures. I found the logic analysis of these questions difficult.

Two protons (p₁ and p₂) and an electron (e) lie on a straight line, as shown. The directions of the force of p₁on e, the force of p₂ on e, and the total force on e, respectively, are:

.
And also,

The diagram shows a pair of highly charged plastic cubes that attract each other. 

Cube 3 is a conductor and is uncharged. Which of the following illustrates the forces between cubes1 and 3 and between cubes 2 and 3?

.

They have been answered now but I guess with out calculating stuff (not that i'm sure I know where to begin) but would try. However, interpreting why they will move in such a way is what I'm not clear on. Just memorising it is not enough. Mostly I was after the key principles to help with my logic. Thanks. (btw I do get most of the basics but there's gaps.)

I got question 3 and 4 aha, only 12 more to go. Only 4 is below. 

Did you determine the final charge on each sphere in each case? How much charge must be transferred to achieve this final value?     (a) Rank the pairs according to the magnitude of the charge transferred during touching, greatest first.   3 > 1 > 2   1 = 2 = 3   2 > 1 > 3     SHOW HINT SHOW ANSWER

Did you determine the final charge on each sphere in each case?     (b) Rank the pairs according to the charge left on the positively charged sphere, greatest first.   3 > 1 > 2   2 > 1 > 3   1 = 2 = 3