00:01
In this problem we are given seven arrangements of two electric charges.
00:07
All of these charges are of the same magnitude by their, but they are either positive or negative.
00:13
And in each of these configurations, we are going to write down the potential at the given, at the indicated point.
00:23
Then we are going to rank these arrangements on the basis of the electric potential at the given point.
00:30
From most negative to most positive.
00:34
Okay, now we have the following setup.
00:40
So we have this grid here, square grid.
00:45
And the grid spacing is given to be 1 millimeters.
00:50
Okay, we have negative here, negative here, and this is the point of interest, p.
00:59
This is a.
01:01
And let us write down the potential at point p.
01:06
So we will do it as one by one.
01:09
So we are going to consider this one first, then this one.
01:13
So for the left one, we have k times klomb constant times negative q divided by, okay, let us call the grid spacing a.
01:26
Let us use this symbolic value instead of a numerical value.
01:30
Because we all have the same grid spacing.
01:34
We all have the same charge.
01:35
So we can write everything as a multiple of.
01:38
Kq over a, which will help us rank them in an easier way.
01:46
Okay, now the potential due to the second one is k times the charge is negative q...