Ampère was the first and is the most famous investigator in electrodynamics.

The resulting formulas sufficed for all motions of a slow nature; it was found, however, that they would not conform to the rapid motions apparent in electrodynamics.

By this theory all phenomena in electrodynamics, as well as mechanics, hitherto irreducible by the old formulaeand there are multitudeswere satisfactorily explained.

Electrodynamics.

Electrodynamics.

Electrodynamics.

Electrodynamics.