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In Larry's indicated reference,(1) Bauerlein writes:
"The symbols A, B, and H denote three prominent vector fields in
electromagnetism. The choice of those three letters appears to be an
alphabetical accident of history. . . . Maxwell . . .(ref. 2) . . .
introduces - with no explanation about usage - what we would write
today as B . . . "
REFERENCES
1. Ralph Bauerlein, "Answer to Question #73. S is for entropy, Q is
for charge," Am. J. Phys. 68(8), 691 (2000); online at
<http://ojps.aip.org/journal_cgi/dbt?KEY=AJPIAS>.
2. James Clerk Maxwell, "A Treatise on Electricity and Magnetism"
(Clarenden, Oxford, 1873).