Relation between amperage and magnetic field?

[Magnethos]

There is any relation between amperage and the magnetic field?

[swansont]

Yes, the field at any point depends on the current. For a straight wire or coil it's linear, though for other configurations the relationship can be more complicated.

[NeonBlack]

Christ, you sound like an engineer.

It's called current.

 

Off the top of my head, I cannot think of any practical case where magnetic field is not directly proportional to current.

[ydoaPs]

[math]{\nabla}{\times}{B}={\mu_0}{J}+{\mu_0}{\epsilon_0}{\frac{\partial{E}}{\partial{t}}}[/math]

 

Where B is magnetic field, [math]\epsilon_0[/math] is permittivity of free space, E is the electric field, [math]\mu_0[/math] is magnetic permeability of free space, J is current density, and t is time.

[thedarkshade]

[math]{\nabla}{\times}{B}={\mu_0}{J}+{\mu_0}{\epsilon_0}{\frac{\partial{E}}{\partial{t}}}[/math]

 

Where B is magnetic field, [math]\epsilon_0[/math] is permittivity of free space, E is the electric field, [math]\mu_0[/math] is magnetic permeability of free space, J is current density, and t is time.

B = magnetic induction

[NeonBlack]

The B has nothing to do with induction.

[Klaynos]

B = magnetic induction

 

It's field and should be a vector, which is not shown by pogo. As should E and J.

 

Now the big question is is it J_free? That is what we where always being asked last year...

[thedarkshade]

The B has nothing to do with induction.

Ummm.. sure?

http://en.wikipedia.org/wiki/Magnetic_induction

[NeonBlack]

Despite the link, I still stand by what I said.

Magnetic induction describes an electric field or EMF which is created by a changing magnetic field

[Klaynos]

Magnetic induction is not incorrect, but normally in physics it's refered to as Magnetic Field, as it is infact a vector field as is E

[imp]

Christ, you sound like an engineer.

It's called current.

 

Off the top of my head, I cannot think of any practical case where magnetic field is not directly proportional to current.

 

What DO Engineers sound like, anyway? imp

 

Edit: I CAN think of a case eluding you as above, but as an Engineer, shall not reveal it.

[NeonBlack]

In general, I'll admit that I don't know what engineers sound like. It just reminded me of one time I heard a couple of engineering students talking about "wattage." I can only assume they meant power. One time I saw a label which gave a rating for some instrument or machine used by engineers. The units on it were something like BTUs/hour/square root hertz.

If I give someone a hard time about this, I mean it jokingly. I've never met anyone who was appalled by the use of the term "voltage."

 

edit: What did you have in mind?

[Klaynos]

In general, I'll admit that I don't know what engineers sound like. It just reminded me of one time I heard a couple of engineering students talking about "wattage." I can only assume they meant power. One time I saw a label which gave a rating for some instrument or machine used by engineers. The units on it were something like BTUs/hour/square root hertz.

If I give someone a hard time about this, I mean it jokingly. I've never met anyone who was appalled by the use of the term "voltage."

 

edit: What did you have in mind?

 

Ironically the term magnetic induction is used more by engineers

[thedarkshade]

Ye got to listen to me sometimes ye know:rolleyes: