0:00
Hello.
00:03
So let's first look at the information we have.
00:05
So we have 120 tens, so the number of tens is 120.
00:14
So this is a square coil of length 2 centimeters.
00:21
So length 2 centimeters.
00:27
You have a magnetic field of 0 .74 .74.
00:35
We have the e max.
00:41
To be 2 .1.
00:44
So e marks is 2 .1 volts.
00:51
So give you this information, you want to find the angular speed of the coil.
00:57
So this brings the concept of faraday's law, right? so the induced emf, e, calls the rate of change of flux, that's the number of tens times the rate of change.
01:22
So flux, phi, equals the magnetic flux.
01:27
Times the area times cosine of theta.
01:34
So if you do this substitution, you're going to have negative d, d t of b a, cosine of theta.
01:48
So because we are differentiating this with respect to t, because b is constant so we can bring it out.
01:54
We're going to have minus n, b a, and then we have d, because omega t or wady.
02:05
So if you differentiate course, we get negative.
02:08
Negative sign...