240 InductanceQ32.8A physicist’s list of constituents of the universe in 1829 might include matter, light, heat, the stuff ofstars, charge, momentum, and several other entries. Our list today might include the quarks,electrons, muons, tauons, and neutrinos of matter; gravitons of gravitational fields; photons ofelectric and magnetic fields; W and Z particles; gluons; energy; momentum; angular momentum;charge; baryon number; three different lepton numbers; upness; downness; strangeness; charm;topness; and bottomness. Alternatively, the relativistic interconvertability of mass and energy, andof electric and magnetic fields, can be used to make the list look shorter. Some might think of theconserved quantities energy, momentum, … bottomness as properties of matter, rather than asthings with their own existence. The idea of a field is not due to Henry, but rather to Faraday, towhom Henry personally demonstrated self-induction. Still the thesis stated in the question has animportant germ of truth. Henry precipitated a basic change if he did not cause it. The biggest
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