# Search results for query: *

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?