00:01
So in this question we have to calculate two things.
00:03
First, we need to find the electric potential at p, and for second part, we need to find the expression of the magnitude of electric failure point b.
00:10
So let's begin by finding the electrical potential at p.
00:12
So let us consider an element of charge dq.
00:24
Consider it where potential that is d .p due to this charge element dq is given by this expression dv is equals to dq over 4 .5.
01:33
Epsilon not times r because exact distance between charge element and point p is r so that is why over here r let's draw the diagram so that you're going to understand this better yeah and here is the charge d cube this is the point b this is the length a and this is the length r so now moving forward.
02:54
So yeah, here r is equal to as we can see, sorry, this is x.
03:07
Here, r is equals to x square plus a square...