2016-11-20 at 3:01 PM UTC
I remember reading about this when I was taking ENM and I understand that relativistic effects come about because the magnetic field is dependent on the velocity of the current that is producing it, but I never really understood WHY the magnetic field comes about. That shit is mind bending. Someone explain plz.
2016-11-20 at 3:03 PM UTC
Sorry lad, it's like the meaning of life, you gotta make your own answer
2016-11-20 at 3:11 PM UTC
Gravity only works on matter, time and space are not matter. Light is not matter. If gravity able to slow down light, so that light cannot escape from black holes gravity, then why big star light and small star light have same speed?
2016-11-20 at 4:21 PM UTC
Please state the nature of the science emergency.
I will have you know that besides physics i am also very good at google-fu, in fact i am a master of the art. Google told me this and i agreed.
(1) Let us first understand how magnetic field can be considered to "arise" because of relativity. Imagine a frame of reference in which a charge $Q$ is at rest. If another charge $q$ is brought in its vicinity, it will experience only an electrostatic force. Now get on to another inertial frame of reference moving at a velocity $\vec{v}$ with respect to the first one. In this frame of reference, you will observe both the charges moving. The static charges of the old reference frame now appear as charges and currents. The electrostatic field of the previous frame now appears as an electrostatic field of different magnitude and a magnetic field. Since physics is the same in all inertial frames of reference, we are inclined to believe that $\vec{E}$ and $\vec{B}$ are manifestations of a single electromagnetic field.
This is a very "hand-waving" kind of an explanation. You may want to refer to Rober Resnick's "Special Theory of Relativity" or Melvin Schwartz's "Principles of Electrodynamics" for greater mathematical details.
(2) The first point tries to explain how magnetism due to a current can be considered to be a relativistic effect. Now let us consider magnetism due to electrons. Apart from charge and mass, electrons also have an intrinsic magnetic moment that can be explained only through relativistic quantum mechanics. Thus, magnetism of a bar magnet is also a relativistic effect. Please note that magnetism in a bar magnet is because of the electron's spin and not orbital motion.
2016-11-20 at 4:30 PM UTC
scientists cannot explain why the magnetic force falls off at distance cube not square.
2016-11-20 at 6:15 PM UTC
I don't wanna talk to a scientist, yall mothafuckas lying and getting me pissed.
