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How do I compute magnetic flux? ( I know that farady's law can be used to find emf)

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- Thread starter austin007
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- #1

- 8

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How do I compute magnetic flux? ( I know that farady's law can be used to find emf)

- #2

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Firstly, what do you understand by "magnetic flux"?

- #3

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Firstly, what do you understand by "magnetic flux"?

It is the product of magnetic field, B and perpendicular surface area to B, A.

I know B which is 1 T, how do I get A especially the angle.

- #4

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Consider the projection of the surface area of the loop onto the plane perpendicular to the magnetic field (sort of like the 'shadow'). (You can consider the loop in 2D - a straight line to simplify the analysis)

- #5

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So is A = pi * r * r cos(10 deg + 20 deg * t) correct?

- #6

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That would be the correct A (perpendicular) for any time t if the rate of increase remains constant over time. However, it would not help you solve the problem. You should formulate it in a generic fashion: A = pi * r * r cos (theta), solve for dA/dt, before substituting the relevant values in to obtain the solution at that point.So is A = pi * r * r cos(10 deg + 20 deg * t) correct?

- #7

rl.bhat

Homework Helper

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At any instant the magnetic flux φ = B*A*cosθ.So is A = pi * r * r cos(10 deg + 20 deg * t) correct?

So induced emf e = - dφ/dt = -(-B*A*sinθ*dθ/dt )

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