The transformations of electric and magnetic fields are usually introduced by viewing systems such as a long, straight current-carrying wire and a parallel plate capacitor in two different reference frames. These well-known examples show that magnetism is a necessary consequence of augmenting electrostatics with relativity. Because they require the full apparatus of Lorentz contraction and Lorentz transformation of forces, they are often postponed until the upper-division undergraduate electrodynamics course.

1.
E.
Purcell
and
D.
Morin
,
Electricity and Magnetism
, 3rd ed. (
Cambridge University Press
,
Cambridge
,
2013
), pp.
306
314
.
2.
The translation of Einstein’s paper “
The Electrodynamics of Moving Bodies
” that we consulted was accessed at http://www.fourmilab.ch/.
3.
D.
Griffiths
,
Introduction to Electrodynamics
, 4th ed. (
Pearson
,
New York
,
2013
), p.
213
.
4.
See, for example,
R.
Nagle
,
E.
Saff
, and
A.
Snider
,
Fundamentals of Differential Equations and Boundary Value Problems
, 5th ed. (
Pearson
,
New York
,
2008
), p.
263
.
5.
D.
Griffiths
,
Introduction to Electrodynamics
, 4th ed. (
Pearson
,
New York
,
2013
), p.
559
.
6.
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