Charged spinning disks


If a charged disk is mounted on a motor. The motor and disk assembly
are not anchored to anything, but are located in an isolated region of
space. According to classical em this disk will generate a B field
around it when it is spinning. According to the same classical em
theory the generation of a B field requires the input of energy, in
addition to the angular KE supplied to the disk. This is in direction
violation of the conservation of angular momentum, as follows. Since
the torque must be greater in order to accellerate the charged disk vs
the uncharged disk, then the angular momentum imparted to the motor
will be greater in the case of the charged disk than in the case of
the uncharged disk. In the latter, the net angular momentum of the
system (motor/disk) will be zero, but in the former the net angular
momentum will be nonzero. Thus classical em theory requires that the
B field itself have angular momentum sufficient to balance the
equation. The problem with this view is that given counter rotating
disks, one positive and the other negative, the kinetic angular
momentum of the system remains at zero after acceleration of the
disks, yet the same B field is observed as in the case of the single
charged disk, albiet increased in magnitude.

From this it follows that the single charged disk does not produce a B
field when set into rotational motion. Moreover, in the case of the
two oppositely charged counter-rotating disks the additional drag
that WILL occur, must be due entirely to interactions between the
charges on those disks, rather than ineraction with the surrounding
space. That is, there is no physical field corresponding to the B
field. Moreover it is apparent that both signs of charge are required
in order to produce the effect that we call the B field. This is
relevant to Benj's current concerns over the validity of classical em
theory wrt Faraday induction. More later.





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