What exactly is a magnetic field?

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A magnetic field is generated when a charged body is in motion, influencing the surrounding space by creating a magnetic force. This motion of charged particles leads to the alignment of magnetic field lines, which can affect other charged bodies in the vicinity. The interaction between moving charges and magnetic fields is fundamental to electromagnetism, impacting various physical phenomena. Understanding these principles is essential for applications in technology and physics. The discussion highlights the importance of exploring the relationship between charge motion and magnetic field generation.
Sharon25
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What exactly happens when a charged body is in motion.What change does it bring about in the space surrounding it.
 
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Sharon25 said:
What exactly happens when a charged body is in motion.What change does it bring about in the space surrounding it.

There have been a number of recent threads on this topic: Here's one post that will point towards one generally accepted answer: https://www.physicsforums.com/showpost.php?p=4475921&postcount=6
 
Thanks for the link. It was very useful
 

Thread 'How to picture the vector potential?'

Susskind (in The Theoretical Minimum, volume 1, pages 203-205) writes the Lagrangian for the magnetic field as ##L=\frac m 2(\dot x^2+\dot y^2 + \dot z^2)+ \frac e c (\dot x A_x +\dot y A_y +\dot z A_z)## and then calculates ##\dot p_x =ma_x + \frac e c \frac d {dt} A_x=ma_x + \frac e c(\frac {\partial A_x} {\partial x}\dot x + \frac {\partial A_x} {\partial y}\dot y + \frac {\partial A_x} {\partial z}\dot z)##. I have problems with the last step. I might have written ##\frac {dA_x} {dt}...
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Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (Second part)'

Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (Second part)'

I am reading the Griffith, Electrodynamics book, 4th edition, Example 4.8. I want to understand some issues more correctly. It's a little bit difficult to understand now. > Example 4.8. Suppose the entire region below the plane ##z=0## in Fig. 4.28 is filled with uniform linear dielectric material of susceptibility ##\chi_e##. Calculate the force on a point charge ##q## situated a distance ##d## above the origin. In the page 196, in the first paragraph, the author argues as follows ...
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