**Special Relativity **

¡°Why¡± is
the speed of light constant?

Time
dilation in Einstein¡¯s theory of special relativity

Electromagnetic
forces and time dilation in special relativity

Lorentz-Fitzgerald
contraction: Why is a moving object shortened?

Origin
of the magnetic force from the perspective of special relativity

The relativity of simultaneity

Lorentz transformation and Rotation, a
comparison

__Comments__:

This
section groups together nine
articles on special relativity, in a suggested order of reading. (You may also want to read pages
177-209 of ¡°The Evolution of Physics.¡±) While the first, the third and the fifth
articles require the basic knowledge on electricity and magnetism, as covered
in the section ¡°Electricity and Magnetism, the first part,¡± others can be read
without these prerequisites. The third and fifth articles show
that Einstein's theory of special relativity is consistent with
electromagnetism. Of course, this should be the case since light is an
electromagnetic wave, and Einstein's theory of special relativity is based on
the fact that the speed of light in vacuum is always constant. Nevertheless, it
is exciting to check these consistencies between electromagnetism and special
relativity in easy ways, since understanding them from the original
construction of special relativity requires advanced knowledge. Moreover, it is
always exciting to see that you arrive at the same conclusion even from very
different perspectives.

The
third article makes use of the relationship between electric current and
magnetic force. Later, in the fifth article, this relationship is partly
derived by ¡°using¡± the special theory of relativity, but the relevant facts are
stated in the third article and can be taken for granted for the purpose of
understanding the point of the third article. If you don¡¯t wish to take it for
granted, you may want to read the articles in the section ¡°Electricity and Magnetism, the first part,¡±
which deal with the interplay between electric fields and magnetic fields.

Unlike other articles, the last three
articles related to Lorentz transformation are mathematical to some extent.
Even though you only need to know the concept of square root to comprehend
them, the derivation of Lorentz transformation might be complicated. ¡°Lorentz
transformation and Rotation, a comparison¡± assumes prior knowledge on
"Rotation in Cartesian coordinates" covered in the section
"Trigonometric functions."