7th: Ampere's law

French physicist Andre Marie Ampere discovered in 1820.
Ampere observed the power committed between two current in an experiment, and summarized the experimental result to Ampere's law, and it succeeded in explaining the phenomenon of the electromagnetism discovered before it. When current was sent, it discovered that a magnetic field produced in the direction around which the right screw turns as a direction to which the right screw follows the direction of current.
This is called "law of Ampere's right screw."

The law showing the relation between current and the magnetic field made to the surroundings of it is called "Ampere's law."
The result of adding the size of the magnetic field in accordance with the closed course is proportional to the sum of the current which pierces through the closed course.
Since it carries out by a curvilinear integral that a magnetic field adds, it is also called "the law of Ampere's circumference integration."