- #1
- 256
- 18
Homework Statement
If you have an electron in the following electrostatic field:
------------------------- (+)
(-) B 2m from origin(-) A 1m from origin
------------------------- (-) Origin
Okay, so; the force field is pushing the electron from point A to point B.
It has more potential energy at point A than point B, meaning point B is moving faster than point A.
So I have to find the velocity of the electron at point A assuming that its HALF of the speed at point B
Homework Equations
F = kq1q2 / r^2
E = kq1q2 / r
Ek = 1/2 m v^2
Et1 = Ek + Ep
Et1 = Et2
The Attempt at a Solution
If we move an electron from point A to point B, we do negative work on it. How is this possible? I don't understand this at all.
Also, if it gains 10 J of potential energy from point B to A, and we have to calculate its speed.. How is this possible?
We have the equation
Ek ---> transfer to ----> Ep
So our change in kinetic energy is now negative.
But we can't take the square root of a negative value, so we can't solve for velocity
Last edited: