00:01
Hi, here we have to solve the following problem.
00:03
Power of the laser is 5 milliwatts.
00:06
And in equation a we have to find the intensity if it's projected onto the diameter of 1 millimeter.
00:15
So this intensity is power divided by the area, which is 5 times 10 power by negative 3 watts, divided by pi, square diameter, and that's multiplied by 4.
00:33
Now let's calculate it.
00:34
That's 6 .37 times 10 power by 3 watts per square meter.
01:03
Alright, that's finally solved.
01:06
Now let's move on to equation b.
01:08
Here we have to find maximum field, maximum magnetic field.
01:15
Let's do this.
01:16
Here the average intensity, which is i over 2, equals to c, b maximum squared, divided by 2 mu 0.
01:29
And now let's calculate b maximum...