Avatar of Max Destiny
Max Destiny
Flag for United States of America asked on

Magnetism and special relativity

We have a reference system in a conducting coil . Our reference velocity is the velocity of current(electrons).

Why the spacing between the nuclei is smaller than if we take as reference system with reference velocity the velocity of nuclei?

Length contraction decreases the dimensions of the nuclei , not making smaller the spacing between the nuclei.
Math / Science* Electronics* electrical engineering

Avatar of undefined
Last Comment
phoffric

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
aburr

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question
d-glitch

A drawing would help immensely.

What is the context of this question?  What are you trying to do, learn, or analyze?

How do you know the velocity of the electrons?  You said something about a coil, so aren't the electrons traveling in circles?

Are you asking about a reference velocity, or a frame of reference?

What is the velocity of the nuclei?
Max Destiny

ASKER
Reference velocity is the velocity which we assume things dont move

The velocity of the electrons is Voltage and Resistance dependent
Max Destiny

ASKER
Thank you Aburr for your help
Experts Exchange is like having an extremely knowledgeable team sitting and waiting for your call. Couldn't do my job half as well as I do without it!
James Murphy
Max Destiny

ASKER
d glitch im trying to see magnetism as relativistic current
phoffric

In SR, length contraction is only in the  direction of the object. At any point on the circle, two portions of the circle are vertical to the object's motion. So they will not be seen as contracted.

The circle is a bit hard for me for that reason to discuss further. But, if you have a long line of electrons moving at a steady velocity, then that electric current creates a magnetic field. If you move at the same velocity in the same direction, then those electrons appear stationary and what you see and can measure is an electric field instead of a magnetic field. This effect was understood before special relativity. Maxwell wrote his equations and came up with this conclusion. For this reason, he went to Faraday, his scientific friend, who is laughed at by other physicists when Faraday made a conjecture that the speed of light was constant, and told Faraday that is conjecture was correct. That is from Maxwell's equations, you could actually compute the speed of light.

Maxwell's equations and michelson-morley experiment were part of the reasons that led Einstein to make the constant speed of light a postulate 4 special relativity.