There is any relation between amperage and the magnetic field?

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.

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.

[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.

[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

The B has nothing to do with induction.

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...

The B has nothing to do with induction.

Ummm.. sure?

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

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

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

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.

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?

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

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