- #1
Mary O'Donovzn
- 17
- 0
Homework Statement
How do you calculate compute the the magnitude of the total force of three charges and also the angle it makes with the x-axis? Knowing the magnitude and also the 2d co ordinates of the charges. (x1,y1) (x2,y2) (x3,y3)
I know for definite I use the below calculation but what exactly is r hat?
K0 * Q1.Q2 / d^2 * r hat
there is apparently 2 thetas aswell.
Homework Equations
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K0 * Q1.Q2 / d^2 * r hat
r hat = cos(theta)i + sin(theta)j
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^I have no idea how to get this with 2D coordinates
The Attempt at a Solution
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In my attempt at a solution I subbed in K0=8.9875 * 10^9
I subbed in Q1Q2 (F12)
I subbed in Q1Q3 (F13)
I subbed in Q2Q3 (F23)
Then for each of them I used the x and y co ordinates of them,.
Then I got 100 % confused by r hat :(
I appreciate any help at all
Thanks in advance :)