write the nature of magnetic field
Answers
Answer:
Magnetic fields occur whenever charge is in motion. As more charge is put in more motion, the strength of a magnetic field increases. Magnetism and magnetic fields are one aspect of the electromagnetic force, one of the four fundamental forces of nature.
Explanation:
To see, what the reason for a phenomenon is, sometimes we have to read the historical facts backwards. Maxwell's explanation about the magnetic field as the result of moving charges was developed in the 1860th. Maxwell used Ampère's circuital law, discovered by André-Marie Ampère in 1823. According to Wikipedia, the law "relates the integrated magnetic field around a closed loop to the electric current passing through the loop."
The reason for the induction of a magnetic field couldn't be explained in this years. Only in 1907 it was predicted that electrons have a magnetic dipole moments: "The idea of elementary magnets is due to Walter Ritz (1907) and Pierre Weiss.".
On what for a phenomenon this prediction was based? It was based on the observation, that a charged body under rotation induces a magnetic field. Wikipedia about the electrons magnetic dipole moment: "From classical electrodynamics, a rotating electrically charged body creates a magnetic dipole with magnetic poles of equal magnitude but opposite polarity." About the magnetic dipole moment Wikipedia says: "... the electron magnetic dipole moment ... is the magnetic moment of an electron caused by its intrinsic properties of spin and electric charge." (The statement about electric charge is a little bit misleading because a neutron has a magnetic dipole moment too).