00:01
Hello, welcome to this lesson.
00:02
In this lesson we have the force f, the charge of particle 1, k1, the charge of particle 2, k2, the distance between the charged particles as l.
00:12
We have electrostatic constant k which is close to 8 .99 times 10 to the power 9 newton meter squared per coulomb squared.
00:21
So the length, the force exerted on each other is given as this.
00:31
Now we are given the force as 4 newton and we are given the distance between them as 10 cm which is 0 .1 meter.
00:45
So here we have 4 equals to k2.
00:53
So those remain constant.
00:56
It's only the distance between them that is changed.
01:00
So we can have 4 times.
01:02
So we have 0 .1 squared which is 0 .01.
01:11
Now that becomes 0 .04.
01:14
Let's go to k1, k2.
01:19
So this will be our first equation.
01:21
Now we are looking at when the distance between them is decreased to 5 cm.
01:28
So here we have another force.
01:33
Let's make the other force f star.
01:39
This is equal to the electrostatic constant...