Homework Help: Magnetic directions

1. Apr 1, 2009

davidelete

1. The problem statement, all variables and given/known data
A wire 3.0 cm long lies perpendicular to a magnetic field with a magnetic induction of 0.40 T. Calculate the force on the wire if the current is 5.0 A. What is the direction of force?

2. Relevant equations

F=BIL

3. The attempt at a solution

I found the force to be .06 N but I have no idea how to find the direction.

1. The problem statement, all variables and given/known data
A wire 1.5 m long is at right angles to a magnetic field.

a. What is the magnetic induction of the field if the force on the wire is 1.5 N and the current is 0.050 A?

b. What is the force on the wire if it is rotated 90 degrees?

2. Relevant equations

F=BIL

3. The attempt at a solution

a. The answer is 20 Teslas.

b. I have no idea? Would it be zero because they are not perpendicular any more?

2. Apr 1, 2009

rl.bhat

I have no idea how to find the direction.
Perpendicular to the plane containing wire and magnetic field.
I have no idea? Would it be zero because they are not perpendicular any more?
It depends upon how the wire is rotated.