BF2S Forums Physics Electromagnetic Help

Flaming_Maniac wrote:

cowami wrote:

Flaming_Maniac wrote:

Yeah, not sure about how to use the torque one. My experiment has completely linear vectors...but maybe I'm just a noob.

I was using Ampere's second law, but that just gets me B, which I think is in teslas, not newtons.

I just used L in the F = ILB equation, and I came out to about 1.something. So much better, still in the wrong direction, but only about 900% error.

Well, just in case you had it at an angle...

The full equation is:
F = ILBsinθ

No angle, but good to know.

mtb thanks for all the help, don't let your geo homework suffer too much.

(rational thought out window)

Well, it might make a difference... L is the length of the wire immersed in the magnetic field B....

Nah my geotech stuff isn't due for a few days, and besides, I enjoy physics

Gonna look through my book a little more but then I might have to call it quits

http://galileo.phys.virginia.edu/classe … ll_Eq.html try this?

cowami wrote:

Flaming_Maniac wrote:

cowami wrote:

Well, just in case you had it at an angle...

The full equation is:
F = ILBsinθ

No angle, but good to know.

mtb thanks for all the help, don't let your geo homework suffer too much.

(rational thought out window)

Well, it might make a difference... L is the length of the wire immersed in the magnetic field B....

It actually does make more sense for it to be the length of the wire and not the length of the magnet. A solenoid doesn't have to have anything restricting its length it's just a wire that's twisted up a lot, it doesn't even have to be twisted around something, so the key is just how much wire there is. The only reason the length of the magnet was used on the other was to determine the density of the wraps of wire in the space. I think so anyways.

gammer, math wayyyyyyy beyond me.

Actually the length isn't the length of the unwrapped wire. If you're using the equation with N in it, then you just need to measure the length of the wire in the depth sense (do you know what I mean?).

cowami wrote:

mtb0minime wrote:

Actually the length isn't the length of the unwrapped wire. If you're using the equation with N in it, then you just need to measure the length of the wire in the depth sense (do you know what I mean?).

So you mean the length of the magnet surrounded by coils of wire?

Just the length of the wire, or thickness of it, or whatever. Not the magnet itself, but the wire.

hrmmmmm

meh

the extent of my knowledge is only so deep, let's see if my friend wants to help

EDIT: He said air resistance and friction, but he's a bit busy studying (as should I be).

Besides, air resistance and friction really aren't going to give you 170K percent error.

Last edited by cowami (2008-03-11 20:47:33)

cowami wrote:

hrmmmmm

meh

the extent of my knowledge is only so deep, let's see if my friend wants to help

EDIT: He said air resistance and friction, but he's a bit busy studying (as should I be).

Besides, air resistance and friction really aren't going to give you 170K percent error.

Tell him it's in the other direction. I'm getting magical force out of nowhere, not losing force.

mtb0minime wrote:

One final thought: you are using correct units right? Meters, not feet, or inches, etc.? I'm pretty sure you've got everything right, but sometimes those common mistakes can hurt.

I've converted all my standard lengths to meters via google, and if there is something else it's hiding from me...ah well, thanks for the help.

This might help

http://www.physnet.org/modules/pdfmodules/m138.pdf

I think you need to use:

B=OL+OKS