- #1
Frostfire
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Homework Statement
So my textbook has a lot of example of conducting rails moving horizontally with unknown variables of F and B, but how would you approach a problem that has such a device pointed vertically with the moving bar droping? let's say R and B are known and we need to find I(current) sufficient to counteract gravity so it doesn't accelerate past a velocity required to generate that current.
Homework Equations
Fb=qv x B
R = delta V/I
Fg = mg (call the mass of the rod m )
I = p/delta V
The Attempt at a Solution
I played with it, but not sure if I am right.The part I am stuck on is what relation of the magnetic field do I set equal to Fg
is it Fg= qV x B