00:01
Hello, here in question a we have to determine field at point a and at point b.
00:05
Let's do this.
00:06
Let's make the sketch.
00:08
Let's label the charges and let's label the distance as d1.
00:22
Actually, let's label each distance as d and the distance between the charges is l which is one centimeter.
00:35
Here q1 is positive, q2 is negative.
00:39
Now let's show the direction of the field at point a and the one at point b.
01:01
Now let's show the x -axis and first let's calculate da.
01:05
Let's find first the middle digit that is kq and here q equals to the q1 and that is divided by 1 over d squared minus 1 over l plus d squared.
01:35
Let me double check it.
01:38
Here the first one, first member is l plus d squared so in the second one we have shape.
01:55
Actually, the previous version was correct.
02:02
So now let's calculate it.
02:04
That's 1 .28 times 10 newton per coulomb directed to the left.
02:45
Now let's calculate the one at point b...