|
“Because the electric field is
uniformly spread over the plates ….” Bleaney and
Bleaney say the field between the plates is uniform. Fewkes and Yarwood
draw a uniform field between the plates of a capacitor. |
|
“Fundamentals of Physics” by R Resnick and J
Walker, pub. Wiley 2001, p761 “32.10 Displacement Current “…. Assuming that the electric field E between the two
[capacitor] plates is uniform …. …. Because the electric field is uniformly
spread over the plates, the same is true of this fictitious displacement
current ….” |
|
“Electromagnetism Second Edition” by S Grant and W R
Phillips, pub. Wiley 1975/1990, p353 S Grant and W R Phillips, Department of Physics,
University of Manchester “Displacement current was introduced by Maxwell in 1962.
With the benefit of hindsight it seems surprising perhaps that people should
have thought Ampere’s original law would apply to non-steady currents.
However the original law correctly described the results of all the
experiments made with the slowly changing currents which were met in the
laboratory at the time of Maxwell. ‘The form of the rules we write down is
more general than the experience from which they are culled, and it is quite
normal to apply them to situations we have not directly experienced. The act
of genius is to realise precisely where it is that we are going too far.*’
Where nowadays are we making the same sort of error as that to which Maxwell
drew attention in electromagnetism? *The quotation is taken from ‘An Introduction to the
Meaning and Structure of Physics’, by Leon N Cooper, Harper and Row, NY,
1968.” …………………………………………………. Grant and Phillips suggest such errors in other subjects,
not in Electromagnetism, which as we all know has now reached perfection. How unkind of Catt to draw attention to a further error,
this time by Maxwell, in exactly the area where Maxwell supposedly pointed
out an error and so supposedly created perfection, later called “Maxwell’s
Equations”. Actually, Maxwell’s “solution” is bogus, because he did not know
that the signal travels between the capacitor plates, at right angles to the
direction that he thought it took. Ivor
Catt 25oct03 @@@@@@@@@@@@@@@@@@@@@ The significance of this document 1 This document demonstrates convincingly that nobody
considered the problem of how electric charge entering a capacitor plate at
one point was suddenly uniformly spread over the surface of the plate. Maxwell,
textbook writers and everyone else did not merely ignore the spreading out of
the charge as a simplification. They betrayed their ignorance when they
gratuitously stated, or implied, that the charge on a capacitor plate was uniform. 2 With less disastrous results, the whole profession has
been misled by the traditional, misleading way of drawing a battery as in Figure
31 in http://www.ivorcatt.com/2_4.htm
, as I noticed after a century. The reality is as in Figure 33. The whole profession has been misled by the traditional,
misleading way of drawing a capacitor as in Figure 26 in http://www.ivorcatt.com/2_2.htm .
This led to nobody for a whole century (until my co-author Malcolm Davidson)
noticing the absurdity of the fashionable model for a transmission line,
modelling a transmission line in terms of itself, see http://www.ivorcatt.com/2_2.htm figures
26, 27. A transmission line is identical to the real capacitor as drawn in
Figure 27. The third, and worst, disaster was the effect on Maxwell
and his galaxy of sycophants, resulting in Maxwell’s so-called “leap of
genius” (according to Heaviside) in inventing “Displacement Current”, which
would have been unnecessary had he (or Heaviside, who had a much better
chance) thought of drawing a capacitor more clearly, with wires attached to
one end rather than to the centre. Ivor
Catt 30oct03 |