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# Calculating Magnetic Flux Linkage question watch

1. I have no idea how to do this question. Well, I have an idea but it doesn't seem to be giving me the right answer. I used the equation as shown above in the image but whichever value of theta I use, the answer doesn't look right.
Theta is either 0 degress or 90 degrees in part (a), but I'm not sure what the question means by the "plane of the coil". Is this the face or the top edge?
And what is the value for N? Is it just 1?
2. Yeah N is one

by plain of the coil it means the plain containing all the wires - the wires are supposed to be a flat square, they've drawn an isometric diagram which is why it looks slanty.

The way I remember which angle to use as theta is that if the coil plain was perpendicular to the field the equation would just say BAN which is the maximum amount fo flux that could go through a coil with that area.

the cos(theta) is just in there to scale the area A the flux can pass through... as the coil rotates the flux is presented with a smaller target till it gets to zero when the coil is edge on to the flux and presenting no area for the flux to pass through.

cos (0) =1 and cos (90)=0

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