Hollow cylinder magnet making contact with the circuit

[TwoEG]

Homework Statement

1. Circuit moves downward while cylinder magnet is fixed.

2. Cylinder magnet moves upward while circuit is fixed.

Gain emf in circuit.

Homework Equations

All those maxwell equations...
F=v x B

The Attempt at a Solution

[/B]
So first question is not that hard. Circuit moves in a static magnetic field. Okay. And I saw second question. Hmm. isn't it just relatively the same case as 1st one? But I've never thought of F=v x B in this way. I tried to see moving uniform magnetic field in fixed charge's coordinate. But it's just uniform magnetic field that doesn't change with time. And me, charge doesn't move at all from my perspective.

To sum up, my question is how does moving-uniform magnetic field is expressed in fixed charge's coordinate and how can I explain the forces that exerted upon this charge?

 

[scottdave]

The cylinders look different. One appears to have a hole drilled in side. Other one has a slot.

 

[TwoEG]

The cylinders look different. One appears to have a hole drilled in side. Other one has a slot.

Yes, but that's not main concern for me. (Maybe I should just attached another adequate picture.)

My question is, there is a magnet and a charge which moves relative to each other. In magnet's coordinate, force exerted on charge can be easily expressed via F = v x B. But how can I explain this force in this charge's coordinate? Clearly v here is zero, and in above case magnetic field is also just uniform.