- #1
availablegod
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hi folks,
this is my first post..and here i would like to present a solution to a paradox posed by feynman in the 2nd volume of his lectures (17-4)...for those of you who wish to see the problem here's the link http://varatek.com/scott/feynman_problems.html
it's the last problem in that page.
Here's my solution :
Considering that there is no other object except the ‘Feynman disc’ in a particular universe, the initial energy stored is the sum of the magnetic field energy of the coil, the potential energy of the system of the charged spheres and the potential energy contained in the mechanical structure itself. When the current is zero then there is zero magnetic field energy in the coil. Now if the disk doesn’t rotate then we can clearly see that there is a violation of the principle of energy conservation. Hence the only other option left for the disk is to rotate and account for that missing energy by the virtue of its rotational kinetic energy.
Since we have figured out that the disk will be actually rotating using the most fundamental conservation law in this universe (Namely the principle of conservation of energy), we assume that there must be some angular momentum already existing in the stationary system. We can logically assume that the angular momentum could possibly be stored in either of the static electromagnetic or electrostatic field, because this is where the energy of the system is initially stored (anything which has an angular momentum is a source of energy). Since the angular momentum that is initially stored in either of these two, is ultimately transferred to the disk, hence we can safely assume that the angular momentum is stored in the static electromagnetic field (the one being ‘changed’). And thus the solution to this whole paradox can be stated as “a static electromagnetic field has an angular momentum attached to it”. Which in fact is the case as have been found by Stedman (1981) and Calkin (1966).
love it or loathe it...just let me know
this is my first post..and here i would like to present a solution to a paradox posed by feynman in the 2nd volume of his lectures (17-4)...for those of you who wish to see the problem here's the link http://varatek.com/scott/feynman_problems.html
it's the last problem in that page.
Here's my solution :
Considering that there is no other object except the ‘Feynman disc’ in a particular universe, the initial energy stored is the sum of the magnetic field energy of the coil, the potential energy of the system of the charged spheres and the potential energy contained in the mechanical structure itself. When the current is zero then there is zero magnetic field energy in the coil. Now if the disk doesn’t rotate then we can clearly see that there is a violation of the principle of energy conservation. Hence the only other option left for the disk is to rotate and account for that missing energy by the virtue of its rotational kinetic energy.
Since we have figured out that the disk will be actually rotating using the most fundamental conservation law in this universe (Namely the principle of conservation of energy), we assume that there must be some angular momentum already existing in the stationary system. We can logically assume that the angular momentum could possibly be stored in either of the static electromagnetic or electrostatic field, because this is where the energy of the system is initially stored (anything which has an angular momentum is a source of energy). Since the angular momentum that is initially stored in either of these two, is ultimately transferred to the disk, hence we can safely assume that the angular momentum is stored in the static electromagnetic field (the one being ‘changed’). And thus the solution to this whole paradox can be stated as “a static electromagnetic field has an angular momentum attached to it”. Which in fact is the case as have been found by Stedman (1981) and Calkin (1966).
love it or loathe it...just let me know
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