Homework Help: Problem on the magnetic force on a wire

1. Jul 24, 2013

electrohau5

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

A wire 42.1 cm long carries a 0.660 A current in the positive direction of an x axis through a magnetic field with an x component of zero, a y component of 0.000330 T, and a z component of 0.00840 T. Find the (a) x, (b) y, and (c) z components of the magnetic force on the wire.

2. Relevant equations

Force on a wire:
F=i*(crossP(L,B))

3. The attempt at a solution

Seems simple, but im getting a wrong answer.

a. 0 (this is correct)
b and c. 0.660*(crossP({0.66,0,0}, {0,0.000330,0.00840})={0,-0.00365904,1.43748E-4}

and niether -0.00365904 (y component, part b),
nor 1.43748E-4 (z component, part c)

are correct.

2. Jul 24, 2013

TSny

Check the number that you used for the length of the wire.

3. Jul 24, 2013

rude man

Do your cross-products again. Show us the details thereof. (Set up the customary determinant rather than your more obscure notation).