(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

a 0.2 meter straight piece of wire has a current of 30 ampere flowing through it, pointing in the +z direction. the magnetic field presented in space is given by:

B = 2B_0i + 4B_0j + 3B_0k

what is the force on the wire?

2. Relevant equations

magnetic force on a current F = IL X B = ILBsin(theta)where X indicate cross product, I is current, L is length, B is magnetic field

3. The attempt at a solution

F = IL X B

F = ILB sin(theta)

F = (30)(0.2)(2B_0i + 4B_0j + 3B_0k) sin(90)

F = 12B_0i + 24B_0j + 18B_0k

i'm not sure sure whether i did the calculation correct, is the 30 amps only multiplied with the 3B_0k since the current points in the +z direction? i multiplied it through all, i,j,k.

will my final answer be presented in components of each axis?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Current on wire, three axes, magnetic force

**Physics Forums | Science Articles, Homework Help, Discussion**