# Does this device give a magnetic field?

Hello,

It's a theoretical question. I take 2 electrostatic particules fixed in a circle. I turn the circle. Is there a magnetic field ? I suppose the angular velocity very high and I suppose the particules are fixed in the circle. The diameter of the circle is very small. I don't want the electromagnetic wave but the magnetic field at low frequency : magnetostatics.

case1/
http://imageshack.com/a/img537/2970/jIKEwq.png [Broken]

case2/
http://imageshack.com/a/img540/3374/ldkDxd.png [Broken]

Regards

Last edited by a moderator:

Dale
Mentor
2020 Award
Hello,

It's a theoretical question. I take 2 electrostatic particules fixed in a circle. I turn the circle. Is there a magnetic field ? I suppose the angular velocity very high and I suppose the particules are fixed in the circle. The diameter of the circle is very small.
Look at the Lienard Wiechert potentials. What do they say?

https://en.m.wikipedia.org/wiki/Liénard–Wiechert_potential

It's only for one particle ? And I'm looking for the magnetic field at low frequency not the electromagnetic wave.

Last edited:
Dale
Mentor
2020 Award
Maxwells equations are linear. Just use superposition.

Sorry, but I don't undertand how to use your link to find the magnetostatic field, could you explain please ?

Dale
Mentor
2020 Award
Calculate the field due to each charge, as described in the link. Then just add them together to get the total field.

Ok, and to have the magnetostatic field ?