00:01
A particle has a charge of negative 3 .35 nanoculums.
00:04
We want to find the magnitude and direction of the electric field due to this particle at a 0 .2 meters directly above it.
00:10
So we have our free body diagram here.
00:13
We have our negatively charged particle with a charge of negative 3 .35 nanoculums, and its distance away from the electric field that we're trying to calculate is 0 .2 meters.
00:23
Because this is a negatively charged particle, the direction of the electric field is going to be pointing towards it.
00:29
And it's only going to have a y component because the electric field that we're trying to calculate is directly above it.
00:36
So we have the indicated direction of the field.
00:42
It's indicated with that arrow right there.
00:46
I'm just pointing to.
00:50
So to calculate the electric field, we need to use the equation k times the charge divided by r squared.
01:02
And because, and we can use j hat to indicate that this is going to be in the y direction because the electric field is pointing downwards, we're going to write a negative sign out in front.
01:16
So the electric field plugging in our numbers, we have negative 8 .99 times 10 to the 9th newton meter squared, coulum squared, times our charge...