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## Homework Statement

So I was given some questions as practice, and I can't seem to do them. Here is a link to the questions:

http://i.imgur.com/ZmkqCAV.jpg (the answers are in square brackets)

Ive only been able to calculate Q3 and Q2 so far. I would really especially like help with Q1. I've been stuck on it for ages.

## Homework Equations

Ive been told this would be helpful: http://i.imgur.com/nmrsk2E.jpg

## The Attempt at a Solution

Ive been stuck on Q1 for ages. I've been playing around with F = k q1q2/r^2 but that's not getting me anywhere.

For Q2: I used E = kq/r^2 for q1 and q2. Subtracting the answers gave me -225x10^3, which is somewhat equal to 2.3x10^5. I've got no idea on how to get the j vector component though.

Edit: I just got the j vector. Pythag and then the formula above got it.

I have no idea where to begin for Q4

ANY help appreciated. Thank you

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