0:00
Hello.
00:02
So this question is about electrostatics and i'm going to be using that formula for finding the force of attraction or repulsion between two charges.
00:14
And that is given by k k k k22 over r squared.
00:25
So r is a distance between the charges, right? so here the charges are identical.
00:31
So i'm just going to be k k k squared over r squared.
00:39
So we're trying to find a chart here.
00:41
So i'm going to try and isolate q squared and that's going to be fr squared over k.
00:53
And so the charge is going to be square root of f r squared over k.
01:01
So now let's try the substitution.
01:05
The force was giving us 5 .4 times 10 to the minus 9.
01:17
And the radius is just a second.
01:23
The radius is 6 .2 times 10 to the negative 10.
01:31
And that is squared...