Insane Electromagnetic Induction Question. Challenge your brains!

1. Sep 21, 2009

geraldino

Insane Electromagnetic Induction Question. Challenge your brains! :D

F=BIL, F=mg

There is a B field acting on the rod so we resolve that.
I tried to resolve the other force vectors according to:
1. Force acting on rod by gravity
2. Force acting on rod by electromagnetic (F= BIL)

but I can't seem to see the link between velocity and force??

2. Sep 21, 2009

facenian

Re: Insane Electromagnetic Induction Question. Challenge your brains! :D

the electric force on wire is
$$\frac{Blvcos\theta}{R}.Blcos\theta=\frac{(Blcos\theta)^2}{R}v$$
This force acts in opposite direction of the gravitational force.

3. Sep 21, 2009

geraldino

Re: Insane Electromagnetic Induction Question. Challenge your brains! :D

Thanks, I got it :)