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**1. Homework Statement**

A current i flows through a triangular loop in the y-z plane. The loop is situated in a uniform magnetic field B.

http://s5.tinypic.com/14csew3.jpg

a) Find the total force on the loop when the magnetic field is in i) the x-direction, and ii) the y-direction

b) What is the magnetic dipole moment of the loop? (use mu=i x area and the appropriate direction)

c) What is the torque on the loop and how will it tend to turn when the field is in i) the x-direction, and ii) the y-direction?

**3. The Attempt at a Solution**

a)x-direction:

F=current x length x uniform magnetic field x sinθ

F=-i x B x l

y-direction:

F=i x B x l cos 45

b) area of a triangle: 1/2(b*h)

since the angle is 45 degree so both height and base are the same.

1/2(l^2)

mu=i*1/2(l^2)

however, I don't really know how to figure out the direction for this question.

c) torque=number of loops*current*area*uniform magnetic field

x-direction:

torque=1*i*1/2(l^2)*B

y-direction:

torque=1*i*cos45*1/2(l^2)*B

I am not really sure whether I did the problem correctly or not...and for some questions I only know how to do part of them

Any comment or help would be great! Thank you very much.

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