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1. Q-Tree Algorithm

Hi, I don't get what the conditions below exactly means. Its which u they are talking about? Is the u the parent or children? Does it mean u = B? and the children are A,C,D? if u is in the quadtree rooted by v:NW then u:x < v:x and u:y ≥ v:y; Thanks,
2. Three identical charges

2) Before I didn't draw it. But now I did draw it. its cos(60)? Because 20N acting 30º east of north and the other force is 20N acting 30º west of north
3. Three identical charges

1) Direction the are going to the north? 2) Sorry, its cos(30) I overlooked the value. Should I do the whole calculation of it? Ok I have revise the forces and vectors addtion again and I will come back in few days!
4. Three identical charges

I think it should be like this? 1) Both forces are showing in the same direction and together it makes 40 N? 2) R^2 = 20^2 + 20^2 -2 * 20 * 20 * cos(50)?
5. Three identical charges

Sorry not really I do not understand. What should I do...
6. Three identical charges

The magnitude will be Q? Now I tried to Now I tried to draw the forces into the triangle. The magnitude on the lower left will q or not?
7. Three identical charges

Yes we had that long time ago. But how do I have to calculate the charges? I am bit confused now.
8. Three identical charges

Because they have the same charge I just add each charge -> Q + Q + Q = 3 Q
9. Gauss' Law: Understand How to Calculate Flux

Hello everybody To calculate the flux for the electric field I need the gauss law. There are two formula one with the integration over some area and the other is Q/e0. When do I have to use which one?