Need help with Daughters physics homework

[frank]

Need some help here quick, needs to be turned in in the morning...How do we find the magnitude of the magnetic force from a straight wire with a 12 amp current flowing thru it at a distance of .11 meters? Any help here would be greatly appreciated...Thanks

 

[Cliff_J]

Obviously you need to show your own work and make sure its in the appropriate unit to the text of your daughters class, but a quick google search turned this up:

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magcur.html#c3

 

[Janitor]

For further edification--

I believe the equation in Cliff's link is derived from the Biot-Savart law and considerations of cylindrical symmetry of a straight conductor.

 

[2Pac]

$$F = \frac {4\pi10^{-7}I} {2\pi d}$$

where
I=current
F=force
d=distance from wire

 

[2Pac]

in order to find the direction of the force you must apply your "right hand" rules. let me know if you need help.

 

[Chen]

As a sidenote, $$4\pi 10^{-7}$$ is the permeability of free space and is denoted by $$\mu _0$$. For more information:
http://en.wikipedia.org/wiki/Permeability