# Homework Help: Magnetic Field Strength Needed

1. May 12, 2010

### sherryjenix

1. The problem statement, all variables and given/known data
Hi, I am trying to calculate the current and magnetic field strength needed to pick up a 0.3125 lb. piece of a channel lock plier made of ferritic stainless steel (they have a soft magnetic component) on its y axis (on the lighter part of the piece) at an 80 degree angle. The magnet would be located 9.36 in. above the piece of steel.

2. Relevant equations
Fb = ILB
Fb = qvB
B = ($$\mu$$0I)/[4pi(y)]

3. The attempt at a solution
I drew a freebody diagram and found that the magnetic force needed to pick up the piece of channel lock plier would be 12.3N. I did more research and found that a magnetic field force would only be exerted on moving charge particles.

Now I am stumped on how to find the current and magnetic field strength without knowing the other.