Part I Magnetic flux 1. a) Recall and write down the...

Part I Magnetic flux 1. a) Recall and write down the definition of magnetic flux, the angle is between ____ and ____. b) Write down the magnetic flux in each case use the symbol given in the diagram. If zero, please just write 0. 2. Open Friday's law simulator a) Keep all as it is when you just opened the simulator, do not move anything. • Is there any flux in the coil? • Is there any change in flux in the coil? • Now select Show Field Lines, check if your answer is correct.

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Transcript

0:00 All right, hello.

00:01 In this question, we are given these three situations, and we are asked about the flux and what that means.

00:09 So part a is recall and write down the definition of magnetic flux, the angle between what and what.

00:15 So we know that magnetic flux is equal to b dotted with a.

00:21 But what does that mean? well, it's going to be the magnitude of b times the magnitude of a times the cosine of the angle between them, cosine of theta here.

00:31 And so what direction do these two vectors point? well, b obviously points in the direction that b points in.

00:39 A points perpendicular to the area.

00:42 So if i draw some area shape, the vector that points completely perpendicular to that, that is at a right angle from that area, that's what a is.

00:55 And so you can see it drawn very well in these pictures here.

00:59 So for the part a, it's the angle between the magnetic field and the area normal vector.

01:10 Part b then says, write down the magnetic flux in each case.

01:13 Use the symbol given in the diagram.

01:16 If 0, just write 0.

01:17 So for a here, our flux is going to be equal to just b times a.

01:23 The cosine of the angle between them is 0 degrees because they're pointing in the same direction.

01:28 And we know the cosine of 0 is 1.

01:30 So it's going to just be b times a...

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