Hanging Wire Uniform Magnetic Field

[jegues]

[SOLVED]Hanging Wire Uniform Magnetic Field

Homework Statement

See figure attached.

Homework Equations

The Attempt at a Solution

$$\vec{F_{b}} = i\vec{L} \times \vec{B}$$

Using my right hand rule, I can see that the force is pushing the wire to the right. This correlates with what is in the drawing.

As the force pushes the wire to the right, due to the finite length of the strings on which it hangs, it will start to move up and to the right.

If I can somehow figure out the force that causes it to move, I can solve for B.

Since the wire is moving to the right and up do I have to relate the force due to the field to the force of gravity somehow?

Thanks again!

EDIT: Solved it. The answer is A I believe.

 

[jbsteele]

The solution is that the wire will move in a circle due to the uniform magnetic field. The force due to the field in this case will be perpendicular to the field, and thus will cause the wire to move in a circular motion.