00:01
Here we'll be using the electric field magnitude for a point charge.
00:07
That magnitude is the electrical constant k times the absolute value of the charge, creating the field, the point charge, divided by the distance squared to the point of observation.
00:23
It's also good to note that electric field is a vector.
00:28
You find the vector by summing up any electric field due to any type of charge distribution, add up all those contributions.
00:43
This is called superposition.
00:47
The superposition is what gives you the direction of the electric field.
00:51
So do take the absolute value of the charge when calculating magnitude, because there should not be any negative magnitude.
01:02
So as an example, we're going to find the electric field, both magnitude and direction, between two charges.
01:11
The one on the left is negative.
01:13
I put the one on the right as positive along the x -axis.
01:18
We are going to be finding the electric field smack dab in the middle of them four centimeters away from each charge.
01:27
So what you want to do is come up with an electric field picture, an electric field picture.
01:36
So at point p, the electric field is going to point inwards towards the negative charge or to the left, and it's going to point away from the positive charge or to the left...