00:02
Hi, here in this given problem there is a square of side a and there are four charged particles kept at its vertices.
00:16
Starting from here, this is the q, then here it is 2 q, then 3 q and finally here it is 4 q.
00:26
Suppose these vertices are marked as a, b and c and d here.
00:37
Side of the square is a each so.
00:44
The length of the diagonal, that will be side root 2.
00:51
In the first part of the problem we have to find net electric field at the position of charge q.
00:58
So as we know, electric field goes away from the positive charge and all these charges are positive.
01:06
So electric fields here at the location of this queue means at point a.
01:11
First of all, there will be electric field due to this two q going away like this.
01:19
Then there will be electric field due to this 4q that will also be going away.
01:25
And as it is because of the 4 times of charge, so it will be larger in magnetity.
01:30
Then due to this three q put at c that is also going away like this so these electric fields are marked as this is e b this is e d and this is ec here then we may have component of this electric field as this angle is 45 degree so component horizontal component will be e c cost 45 degree and vertical component this will be e, c, sign, 45 degree.
02:11
Now, to find the net electric field in this first part of the problem, net electric field experienced by this charge q, first of all, we find magnitudes of different electric fields...