00:01
In this question, we need to calculate the change in electric potential energy by moving a 3 nanocolon point charge from point a to point b in this setup.
00:11
Okay, so solution.
00:17
Okay, so we'll be using a few formulas such as delta u equals to q times delta v.
00:25
And then we also need the potential electric potential due to a point charge, which is b equals kq over r.
00:33
So, q in this case is 3 nanoculum, and then the big q in our question will be 25 nanolums.
00:48
So delta u goes to q times delta v.
00:54
So this is q times vb minus va.
00:59
Okay because the final location is b the initial position is a okay and then rq times kq over r b this is vb and then va is kq over ra okay so you have k bq times small q one over r b so this is equal to r b and here this is ra, okay.
01:36
So we can substitute the numbers...