Re: Double Slit & Aharonov Bohm Effect



David wrote: 
In volume II page 15-11 and 12 of Feynman Lectures of
Physics. Iron whiskers are mentioned as in:

"Precisely this experiment has recently been done. It is a very,
very difficult experiment. Because the wavelength of the
electrons is so small, the apparatus must be on a tiny scale
to observe the interference. The slits must be very close
together, and that means that one needs an exceedingly
small solenoid. It turns out that in certain circumstances,
iron crystals will grow in the form of very long,
microscopically thin filaments called whiskers. When
these iron whiskers are magnetized they are like a
tiny solenoid, and there is no field outside except
near the ends. The electron interference experiment
was done with such a whisker between two slits,
and the predicted displacement in the pattern of
electrons were observed".

Guys. Isn't it the official Aharonov Bohm experiment was
conducted in 1985. How could Feynman be mentioning
it in his 1964 book unless he was referring to another
experiment?. I thought 1985 was when it was first
experimentally confirmed. Can anyone all clarify this?

It's impossible to produce a contained alternating field. Let me explain the alternating part: Any passing electron will induce a polarization of any material whatsoever, especially that located within the system, i.e. nearer the trajectory. Look up "magnetron". The presence and and subsequent absence of any body at all from the system constitutes a change in the system geometry, and a subsequent alteration to the interference pattern. The effect may be too small to measure given some instances, but large enough to measure given others. The presence of a polarized macroscopic field should certainly produce an observable effect.

Recall that, in the thread to which the OP refers, I posited that the em waves pass through everything, never being absorbed, but simply being superposed over destructively by secondary radiation of the intercepted charges, i.e. that radiation produced by their recoil. All of these waves are spherical per Einstein's 1905 paper. Thus, though a field may be nulled by some means external to the coil, it is not nulled within it, and the waves that I refer to pass through it, i.e. into the region in which the field isn't nulled. Thus secondary radiation will be emitted by the particles within the coil as well, and one would understandably expect this secondary radiation to influenced by the internal field. IOW, the radiation due to the recoil of the charges within the coil will by torqued in a manner similar to the torque provided by a calcite filter. Though the result of this influence may be difficult to account for in a quantitative fashion, it is nevertheless an obvious general prediction of my model.

Richard Perry

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