Insane Electromagnetic Induction Question. Challenge your brains

[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??

Thanks in advance guys :)

 

[facenian]

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.

 

[geraldino]

Thanks, I got it :)