Expanding and collapsing of a magnetic field

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Beta tron is a device for speeding up electrons to extremely high energies with the help of expanding magnetic field. The beta tron differs from cyclotron in the two fundamental respects -

1) in beta tron the electron are accelerated by expanding magnetic field

2)the circular orbit has a constant radius.

Unknown.

It started at the "big bang" and is still expanding,

and now it seems to be expanding even faster (so-called dark energy)

But the "why" is a total mystery.

Most often by heating water into steam,

or by expanding gasses (internal combustion engines).