Questions tagged [electromagnetism]
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8
questions
21
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4answers
3k views
Could an electromagnet be used to raise the apogee of a satellite orbiting Earth?
Suppose we have a satellite orbiting Earth in an elliptical orbit, which has an electromagnet inside it. As the satellite goes from its apogee to its perigee (i.e. losing altitude), it turns on the ...
1
vote
2answers
61 views
How to calculate the force applied by a magnetorquer on a piece of a perfect ferromagnetic material?
How to calculate the force applied by a magnetorquer on a piece of a perfect ferromagnetic material at a particular distance in vacuum given that I know the actuatuon (in Am2)
https://www.isispace.nl/...
1
vote
0answers
26 views
Highest frequencies of EMPs in space
When a nuke detonates, an EMP at about 100 MHz followd. A pulsar on the other hand, has a comparatively low frequency, and while I know that this frequency depends on its spin and doesn't represent ...
2
votes
0answers
37 views
Can Lorentz forces partially cancel centrifugal forces?
If we had a tidally stabilised skyhook (https://en.wikipedia.org/wiki/Space_tether#/media/File:Skyhooks.gif) with electric charge and with a vector of force aiming towards the center of the Earth, ...
6
votes
1answer
167 views
What is the formula for the gain factor of a ferromagnetic core for a torquer coil rod?
I am an undergraduate who is currently designing an actuation system for a CubeSat, more specifically a PCB magnetorquer. (with 2 ferromagnetic core coils and one air core)
I made an excel sheet that ...
1
vote
0answers
33 views
Velocity of a charged particle due to electric field in relativistic limit [closed]
I am trying to calculate the velocity of a charged particle moving through a constant E field.
I understand that I can set $\frac{1}{2}mv^{2} = qV$ to give $v = \sqrt{\frac{2Vq}{m}}$
However, im not ...
2
votes
1answer
273 views
Space-borne electromagnetic lens to focus energetic charged particles
Is it feasible to build a spaceborne electromagnetic lens (such as but not limited to a solenoid) of large area (perhaps as large as the ring at the supercollider at CERN) to gather and intensify ...
2
votes
1answer
317 views
How strong is Sun magnetic field on Moon surface? And on Mars?
I wan to calculate the voltage difference generated by sun EM Field on a wire placed on Moon or Mars surface, but I can't find consistent data about solar EM Field.
I found different values:
The ...
