Tagged Questions
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votes
0answers
81 views
Equivalence between a charged rotating cylinder and a solenoid
Suppose we have a cylindrical shell of radius $r$ with surface charge density $\sigma$. Then we start rotating the cylinder at an angular speed $\Omega$. You can show that in this case the surface ...
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0answers
97 views
Nuclear Magnetic Resonance (NMR) Conceptual Questions
Let $M$ be the magnetic moment of a system. Below are the Bloch equations, including the relaxation terms.
$$\frac{\partial M_x}{\partial t}=({\bf M} \times \gamma {\bf H_0})_x-\frac{M_x}{T_2} $$
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4
votes
1answer
150 views
Stability of a rotating ring of multiple electrons at relativistic speeds
There was a time when physicists where concerned about electron internal structure. The rotating ring model was one of the proposals to explain how a charge density could become stable against ...
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0answers
246 views
How does the Commutator and Brushes causes flip? [closed]
I'm trying to make a simple electric motor just for fun project. I've reading this article to understand how an electric motor works. So far, I have been able to make something like as seen in picture ...
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0answers
327 views
How to design a hand rotate dynamo [closed]
I want to make a dynamo which can produce electricity. My requirements for the dynamo are as follows.
I need to charge my laptop through this.
I want my laptop to run for 1hour with this energy ...
2
votes
0answers
193 views
Levitation rotation speed involving laser acceleration, pyrolytic graphite and a vacuum
The experment would involve a small NIB magnet levitating between or on the diamagnetic material pyrolytic graphite, unlike other forms of levitation this doesn't require power to run such as ...
7
votes
5answers
2k views
What is the electric field generated by a spinning magnet?
Consider a cylinder of permanently magnetized material, with uniform magnetization pointing along the cylindrical symmetry axis (the $z$-direction). The magnet is rotating about its cylindrical ...
