Recent content by xerxes73
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Graduate Reconciling Magnetism in material and the Lorentz Force equation
Thanks Tiny-Tim So if you took the spins calculated what forces are in play and what E and B fields are there, they would follow this classical Lorentz force law, or does this break down pretty quick in the face of quantum mechanics? I guess I have heard that Maxwell came up with a strange...- xerxes73
- Post #3
- Forum: Electromagnetism
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Graduate Reconciling Magnetism in material and the Lorentz Force equation
Hello, The Lorentz force equation, F = q (E + v x B), is a complete description of the force on bodies arising from Magnetism and Electricity, right? So somehow it must be possible to get from the magnetism that exists in materials (like in a magnet) to this equation. I don't see how the...- xerxes73
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- Force Force equation Lorentz Lorentz force Magnetism Material
- Replies: 4
- Forum: Electromagnetism
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Graduate Area section of a sphere used for integration?
I cannot figure out why the area of a section of a sphere used for integration is: (r * dtheta) (r * sin(theta) * dphi) ? where dtheta and dphi are the differential angles that subtend the arcs, which make up the sides of the rectangle used for the differential area. I did an...- xerxes73
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- Area Integration Section Sphere
- Replies: 1
- Forum: Differential Geometry
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Undergrad Why can you see stars (1/r or 1/r^2 dropoff of power)?
I read somewhere that people can see stars because an electromagnetic wave drops off by 1/r, therefore the power delivered by the electromagnetic wave stays strong enough to activate the receptors in your eye. I believe, this 1/r relation was realized by Maxwell when he was analyzing and... -
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Understanding the Cosine Wave Frequency Domain
Thanks for the patient explanations. I can't say I have intuitively grasped this yet but I am not finished playing with these new ideas provided by you all on basis, eigenfunctions, and vectors in the s plane. I just wanted to send a quick note of thanks. -xerxes73- xerxes73
- Post #6
- Forum: Electrical Engineering
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Understanding the Cosine Wave Frequency Domain
Actually I meant, euler's inverse formula: cos x = e^ix / 2 + e^-ix / 2- xerxes73
- Post #2
- Forum: Electrical Engineering
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Understanding the Cosine Wave Frequency Domain
So...a cosine wave when shown in the frequency domain is represented by a 1/2 magnitude vector at the positive frequency and a 1/2 magnitude vector at the negative frequency. I am surprised by this because I cannot understand why a vector of magnitude 1 at the positive frequency of the cosine...- xerxes73
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- Cosine Domain Frequency Frequency domain Wave Wave frequency
- Replies: 8
- Forum: Electrical Engineering
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Graduate Molecular spin alignment having macro torque effects?
Thanks! I appreciate the info. This led to some interesting reading. -Xerxes73- xerxes73
- Post #4
- Forum: Atomic and Condensed Matter
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Graduate Molecular spin alignment having macro torque effects?
Hello, If a magnetic field aligns the electron or nuclear spins can that have a macro effect of causing torque? So for example if we had a rod and we fixed one end but allowed it to freely rotate and then aligned electron or nuclear spins would that cause the rod to rotate? Thanks, Xerxes73- xerxes73
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- alignment Effects Molecular Spin Torque
- Replies: 3
- Forum: Atomic and Condensed Matter
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Graduate Electron Precession versus Proton Precession in a Magnetometer?
Hello, Why is it that electron precession is not used in addition to proton precession in a proton precession magnetometer? It seems to me that when the frequencies are emitted as the protons precess that the electrons would do precessing at the same time and provide a secondary frequency to...- xerxes73
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- Electron Magnetometer Precession Proton
- Replies: 1
- Forum: Quantum Physics