Recent content by nataelp

I have figured out the problem now. Thank you all for your help!

Should the unit vector be <-5, -10, 8>/13.75 (magnitude of distance vector)? Then I multiply "F = k*q1*q2/13.75^2" by that unit vector, and I have my answer?

How can I calculate a unit vector for force without its components though? Or am I supposed to calculate a unit vector for the distance and then multiply by that? I'm honestly not sure what you mean.

So I need to find the magnitude of the vector from q2 to q1 (in m), use that as r, and then to find the force along the i j k directions, I need to calculate a unit vector along those directions? Then multiply by that unit vector, which is each component divided by the magnitude?

So I did this: For the force along each axis, I used F= k*q1*q2/r^2. I had the charges, and k is a known value, so I just needed the distance r. For r along the x-axis, for example, I used 4-9 as r because it should be the distance in the x-direction. So I solved it with that value and got my...

If you mean in the vector form, it would be <-5^2, -10^2, 8^2>. And those are the values for r I used to find the force on each axis. The answer WebAssign gave me was this: My problem is I don't know how to get to this answer.

It should be 13.72 using the Pythagorean theorem.

I got (-0.0058, -0.00144, 0.00225)

And to be clear it was not the direction of the vector that was wrong, I can see that the magnitude is completely off, but the direction was correct.

I tried using the distance between r2 and r1 and plugging them into the equation for i, j, k. >> So for the force in the x direction it was k*(4E-6*4E-6)/(4-9)^2. The answer I got was wrong according to webassign. Can someone please tell me what I am missing?