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On the Ewing Model of Magnetism

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initialization data
randomize
137
n
x
6
n
y
6
n
z
1
cell site
0.01
fill factor
0.9
ρ
7900.
κ
0.1
J
1.
runtime data
B
r
0.
B
θ
/ °
0.
B
ϕ
/ °
0.
η
2.
log
10
(Δt)
-4.
execution and appearance controls
run
freeze
reset
cool
spheres
lean
As the Scottish physicist James A. Ewing wrote near the end of the nineteenth century [1, p. 348]: "It is extremely helpful… to experiment with a model consisting of a number of short steel magnets pivoted like compass needles on fixed centers and placed near enough to one another to allow their mutual control to be felt." This Demonstration is a mathematical model of Ewing's device (for Ewing, a model was something that came out of a workshop). The main action is to activate the run box. Hover the pointer over the control labels to see tooltips with explanations.
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