- #1

Cardinalmont

Gold Member

- 22

- 4

Thank you for reading my post. I was thinking about induced emf and magnetic flux and I realized I have a huge misunderstanding, but I don't know exactly what it is. Below I will list 4 statements which I logically know cannot all be simultaneously true. Can you please tell me which one(s) are incorrect in order to aid my understanding?

1. In order to create an emf in a conductor there must be a change in magnetic flux.

This can be seen by ε=NΔΦ/Δt, If ΔΦ=0 then so will ε

2. Magnetic flux is equal to the product of a conductor's surface area, magnetic field passing through that surface area, and the angle between the two. This is given by Φ=B⋅A

3 When a wire moves through a uniform magnetic field, neither its surface area, nor the strength of the magnetic field, nor the angle between the two are changing ∴ change in magnetic flux = 0 ∴ There is no induced emf.

4 When a wire moves through a uniform magnetic field, an electromagnetic force will force electrons in the wire to one side inducing an emf.

It is clear to see that points 3 and 4 are in direct contradiction of each other. I believe 3 is false, but I can't see the logical flaw! Please help me!

Thank you.

1. In order to create an emf in a conductor there must be a change in magnetic flux.

This can be seen by ε=NΔΦ/Δt, If ΔΦ=0 then so will ε

2. Magnetic flux is equal to the product of a conductor's surface area, magnetic field passing through that surface area, and the angle between the two. This is given by Φ=B⋅A

3 When a wire moves through a uniform magnetic field, neither its surface area, nor the strength of the magnetic field, nor the angle between the two are changing ∴ change in magnetic flux = 0 ∴ There is no induced emf.

4 When a wire moves through a uniform magnetic field, an electromagnetic force will force electrons in the wire to one side inducing an emf.

It is clear to see that points 3 and 4 are in direct contradiction of each other. I believe 3 is false, but I can't see the logical flaw! Please help me!

Thank you.