charge and magnetism

[Ankit Gupta]

why do a moving charge particle create magnetic field which it does not produce in stationary phase , i mean what special thing come in it when it starts moving ?

[swansont]

A magnetic field is what an electric field looks like when you are moving.

[Enthalpy]

[...] what special thing come in it when [the particle] starts moving ?

Maybe you'd like an explanation more detailed than electromagnetism provides.

 

Within electromagnetism, "moving charges create magnetic fields" is a fundamental law (mathematicians would say: an axiom) which has no explanation more fundamental, but serves to explain more things. A set of equations, for instance Maxwell (or an equivalent set, like Biot and Savart plus others) have been agreed on because they explain observations.

 

Compare with taste: the ocean is salty, an oyster is salty, but how does salt taste? ...salty, and no better description.

 

So: no explanation like "the movement lets the sensor vibrate" or "it spans a spring" is to be expected. But the set of electromagnetism laws explains many things properly (...when applied well, which is not trivial).

 

Unified theories for electromagnetism and for the weak force would be even more fundamental, but these are even more abstract, and won't provide the kind of answer you apparently hoped.

[J.C.MacSwell]

why do a moving charge particle create magnetic field which it does not produce in stationary phase , i mean what special thing come in it when it starts moving ?

The "special" thing is Special Relativity. The current speed can be well under what would normally yield some other relativistic effects, but even slightly more "ladder in the barn" gives us the magnetic effect.

 

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

 

Of course anything moving with the current would recognize just a static field.

Edited August 9, 2013 by J.C.MacSwell

[Ankit Gupta]

A magnetic field is what an electric field looks like when you are moving.

but according to lorrenz force both electrostatic and magnetic force act on a moving charge particle so i think we cant say , magnetic field is moving electric field

[studiot]

The classical view (originated by Ampere) is that magnetism is generated by (very) small current loops.

 

This works for Gauss and Amperes law (without relativity).

You should look up the 'Rowland Ring' theory, which is the most modern version.

 

The more modern quantum view is that the loops are replaced by the spin of the electrons.

 

By the way I think you are doing very well for your age.

Edited August 9, 2013 by studiot

[swansont]

but according to lorrenz force both electrostatic and magnetic force act on a moving charge particle so i think we cant say , magnetic field is moving electric field

 

The effect will be the same no matter what reference frame you are in, though. In one frame you might have a purely electric field, while in another, it's a combination, and the relative contributions will depend on the frame. The magnetic field is the result of that relative motion.