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    Quantum entanglement , ftl

    I have wondered about this experiment and I come to the following problem. How can bob tell the difference between his electrons before and after Alice measures one of her set? I wonder if a Elitzur–Vaidman bomb tester could be set up to serve such a purpose? I read a paper where they showed it...
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    How magnets attract objects mechanically?

    Light is the physical phenomenon responsible for magnetic and electrostatic attraction and repulsion. Light carries momentum from one charged body to another, the direction depends on the sign of the charge. Magnetism is the consequence of relativistic motion (in familiar cases rotational or...
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    Bell, EPR, paradox or not

    This is where I have a problem. The average value of the polarization of the "photon" after it encounters the first polarizer can't tell you anything about what happened upstream of it. But thats the average.. not the instantaneous. Angular momentum and everything is conserved, so if a "photon"...
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    Bell, EPR, paradox or not

    Thanks for this, but what does 10 or 20 triplets mean in this context? I can't concentrate anymore so I'll have to look at that paper later... Individual values independent of the act of observation meaning that my electron really has a value for its x and y spin simultaneously regardless...
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    Bell, EPR, paradox or not

    Finally, it should also not be mystifying that QM doesn't allow us to predict certain things with absolute certainty. It can be proven that any particular theory will always be unable to predict certain things. Bell did this. At the end of the day I'm not really arguing with Bell, although based...
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    Bell, EPR, paradox or not

    I have another one. This one is harder to explain so cut me some slack. Imagine two people, Alice and Bob who are color blind. Or rather, that they can only detect brightness of a certain hue, no matter what detector they use. Write the hue that they can detect with a vector (R,B) with R...
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    Bell, EPR, paradox or not

    I meant 120° from eachother, not both at +120°. Sorry for that confusion.
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    Bell, EPR, paradox or not

    I keep looking at these experiments that demonstrate violation of Bell's inequality and I really can't figure out why anyone cares. The scenario always seems wrong in some way. For example the EPR paradox. The argument goes like this, if you start out with a source of entangled "photons"...
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    Quantum mechanics comment

    Even the sum of all histories interpretation agrees that there is only one history. Its just that its the sum of all possible ones...
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    Joy Christian, Disproof of Bell's Theorem

    I finally like where this thread is going. I've literally been losing sleep over this for some time.
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    Double slit experiement?

    The wavefunction that describes the electron is calculated based on the geometry of the experiment and provides a statistical prediction of which screen locations are more probable than others. The wavefunction is a vector field, and so when two of them are superimposed, the vectors at each...
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    Squashing Shot Noise - help please

    How did you connect them in this case? To average the analog voltage I would buffer and Low Pass Filter each sensor and then average them with resistors or an Analog Summer. For the modulation method, obtain a clock signal at an appropriate frequency, perhaps 150k-500kHz and use it to control...
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    Wireless Electricity

    Agreed. In the situation I was describing the L and C would be in parallel, just like in a Tesla Coil.
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    Infinitely small.

    Its true that direct evidence for this has not been observed, but the current (unconfirmed) theory to which I subscribe states that you can't compress any object that has a non-zero number of microstates (entropy) into a volume bounded by a surface with less area than 4 square...
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    Entanglement and Bell's theorem. Is the non-locality real?

    I dont understand what bells inequality is refuting. Why does local realism predict a different outcome? The probability for a photon to pass through a polarizer is the Cos of the angle between it and the polarizer. So if you put a source of linearly polarized photons through a polarizer...
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    Capacitors, why even bother?

    Firing a capacitor out of a cannon would also energize it, so its not any less ambiguous than saying charge.
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    Capacitors, why even bother?

    Ratch, Everyone says Charge interchangeably with Energize in the context of batteries and capacitors... I bet you say "Hey where is my battery charger?" when you need to "Energize" the batteries in your phone or whatever. Nobody says "I have a capacitor C net charged to V volts and...
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    Dipole antenna question

    It looks like the artist is drawing the field lines as they radiate outwards at 3 different phases of the sinusoidal potential difference being applied to the antenna. Heres an animation of the same thing from wikipedia. The color indicates the strength and direction of the magnetic component of...
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    Squashing Shot Noise - help please

    Could you average the signals from several phototransistors? If the noise is random it should average to zero from multiple detectors. Could you modulate the source and attempt a lock-in method to remove the noise? Welcome to the Physics Forums.
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    Wireless Electricity

    Intuitively I assume yes.
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    Radiation Detection / Spectroscopy Project

    Welcome to the Physics Forums! Good work pursuing education in your own time. Do you have a specific question? I have heard of a type of scattering that is theoretically applicable for toxin detection. I think its called Raman Scattering since it is sensitive to molecular configuration.
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    Infinitely small.

    Some sub-atomic particles, like electrons, are treated as "point-like" particles, and no attempt to measure or calculate a "radius" or "size" has been successful. As far as we can tell with our limited information at this time, electrons behave as if they are infinitely small. We have never...
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    Can't have high voltage function generator. What about low voltage Tesla coil?

    What kind of electric field do you want as a function of time?
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    Wireless Electricity

    The Capacitor in the two resonant circuits makes each into a self-resonant device, capable of storing energy. The energy is stored in the magnetic field when the capacitor is discharging electric field, and in the capacitor when the coil's magnetic field is collapsing. This is different from a...
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    Speed of light - causality - etc

    Its an actual affect on causality, even after the travel time of the light reaching the observer is corrected for. Its different from the way sound works because the speed of sound is not the absolute speed limit of space. What you are asking about is called Relative Simultaneity of Events. It...
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    New discovery

    *brain explodes*
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    Dark Matter and Dark Energy: WTH are they?

    Nobody knows for sure what Dark Matter and Dark Energy are at this time. Explaining their existence is one of the main goals of modern theorists.
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    A few questions about solid-state relays

    Why do you want an analog voltage signal? From the data sheet, I see what you mean when you theorize that this is a current controller device. It seems that applying a current source of 20mA to the input pins should close the relay, and 0.1mA will open it on the next zero crossing. I agree you...
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    Needing some guidance on getting into Electrical Engineering as a hobby

    I recommend The Art of Electronics by Horowitz and Hill for general EE. Its one of my favorite books of all time. It spans really basic intro stuff, analog electronics, digital and mixed signals, all the way to microcontrollers and pcb design. The latter two items are probably pretty dated by...