# Magnetic Force, Moment, and Torque on Square Current Loop

#### musiliu

1. The problem statement, all variables and given/known data

[PLAIN]http://img521.imageshack.us/img521/5139/physicsproblem.jpg [Broken]

2. Relevant equations

FM in uniform magnetic field = I L x B

m = I A2 where A is the area, direction given by Right Hand Rule (perpendicular to plane of loop)

T = m x B

3. The attempt at a solution

I need to know if my answers are correct..need fast confirmation/help.

a) using the 1st equation in the "Relevant equations"
i added all forces and it equaled to zero. but I am not sure if the unit vectors with
1/ sqrt(2) should play a role in the calculation.. I just used the i hat and k hat without the 1 / sqrt(2).. is this ok?

or...am i supposed to factor out the 1 / sqrt(2) for the magnitude of B so it's like 1/sqrt(2)B0 ?

b) using 2nd equation in "Relevant Equations":

m = I0 a2 B0 k hat

c) T = a2 I0 B0 j hat

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