# Need help with Daughters physics homework

1. Apr 1, 2004

### 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

2. Apr 1, 2004

3. Apr 1, 2004

### 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.

4. Apr 2, 2004

### 2Pac

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

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

5. Apr 2, 2004

### 2Pac

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

6. Apr 3, 2004