00:02
All right, so the first part, part a, once you defined the magnetic flux through b coil.
00:11
And so magnetic flux, if you'll remember, is, or calling advice of b, is the magnetic fill strength b times area a of the coil times cosine, small 5.
00:31
The angle relative to the perpendicular axis.
00:36
Okay, so and then there are n number of coils, so you multiply the whole thing by n.
00:44
So total magnetic flux total before is phi sub b comma i, denoting initial, is equal to n b a cosine, in this case, phi is zero because it is perpendicular to the coil is perpendicular to the plane.
01:14
Sorry, the coil's plane is perpendicular to the earth's magnetic field.
01:20
So that's zero.
01:21
And so this is 200 for the number of turns times b in tesla, it's six times whoops, it's six times 10 to the negative 5 tesla and times area.
01:43
It's 12 times 10 to negative 2 squared.
01:47
So this will read 12 times 10 of the negative 4 meter squared because that's an si unit right there.
01:55
So the total flux before is 7 .2 times 10 times 10 to the negative 8.
02:05
Weber's times this 200.
02:08
So the answer is 1 .44 times 10 and negative 5 webbers...