Concerning “hidden momentum”
نویسندگان
چکیده
منابع مشابه
J.J. Thomson and “Hidden” Momentum
The term “hidden momentum” was introduced by Shockley [1] in 1967 to describe the small amount of net mechanical momentum that must exist in systems “at rest” that have nonzero electromagnetic field momentum. The classic example is a current loop (Ampèrian magnetic dipole) in an external static electric field (perhaps due to a single electric charge) [4, 5]. This example had been considered by ...
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1 Problem An impressive demonstration, in which a bead chain appears to leap upwards from a beaker, before arcing over and falling down, is given at Two photos from this video are shown above. Discuss the motion of the beaded chain, and relate it to " hidden " momentum, as defined in [1], P hidden ≡ P − Mv cm − boundary (x − x cm) (p − ρv b) · dArea = − f 0 c (x − x cm) dVol, (1) where P is the...
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1 Problem Discuss the momentum (mechanical, field, and total) of an e+e− pair in the classical limit, supposing the particles move in a circle at opposite ends of a diameter. Take into account that the electron and positron have rest mass me, electric charge of magnitude e and magnetic moments of approximate magnitude eh̄/2mec (in Gaussian units), where h̄ is Planck’s constant divided by 2π, and ...
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The cylinder (of radius a) and the plates of the capacitor (in the planes y = ±b) can move independently and without friction in the x-direction, where the z-axis is that of the cylinder. That axis can be electrically charged with the opposite sign to that of the cylinder such that the cylinder as a whole has zero charge. The (linear, isotropic) medium between the capacitor plates, including th...
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The gas molecules appear to have zero average velocity in the rest frame of the pressure vessel, so it appears that they have zero average momentum in this frame. Of course, the gas molecules exert a force F = AP on a portion of area A of the wall of the pressure vessel, and since force equals the time rate of change of momentum, we can say that the gas can transmit momentum without possessing ...
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ژورنال
عنوان ژورنال: American Journal of Physics
سال: 2008
ISSN: 0002-9505,1943-2909
DOI: 10.1119/1.2815366