- #1
CaptainOfSmug
- 13
- 0
Homework Statement
An xyz coordinate system contains three charged particles: particle 1, q1=− 6.5μC , at (4.0 m,-2.0 m, 0); particle 2, q2 = 12μC , at (1.0 m,2.0 m, 0); and an electron at at (-1.0 m, 0, 0).
Determine the x, y, z components of the vector sum of the vectors of the electric forces exerted on the electron by particles 1 and 2.
Homework Equations
[itex]F = \frac {kq_1q_2} {r^2_(12)}[/itex]
Distance formula
The Attempt at a Solution
Okay,
So I first started off by plotting all the points, finding the expected final force and direction pictorially. Now, plugging and chugging Coulombs Law was my first instinct but unfortunately I came into problems (most likely with vectors). I know I needed to find the distance between both the particles and the electron. I did this by just using distance formula where I got:
Distance between 3 and 2: [itex]2\sqrt2[/itex]
Distance between 3 and 1: [itex]\sqrt29[/itex]
Now here is where my problem is arising. Obviously this is in 3 space so I'm assuming the directional values applied to Coulombs law will need to be in vectors. My book did not go into any sort of detail on this and I'm not sure how the formula would then look.
Could I potentially just take make a unit vector out of all three points and then multiply them by the respective force formulas? And if this is the case, would my distance formula idea be wrong? I'm trying to remember if it is "legal" to multiply my scalar by a unit vector...
Anyhow I greatly appreciate any help, I've been pondering this problem for a couple hours now with not a whole lot to show for it...
Cheers!