Magnetism and an electricity. Andre Mari of Amperes

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French scientific Andre Mari of Amperes (1775 - 1836) is not limited to repetition of experiment and declares soon the ' a rule of the swimmer ', allowing to establish a direction of a deviation of a magnetic needle under the influence of a current. The ampere then combines opening of Ersteda with for a long time already known phenomenon of influence against each other constant magnets. It is known that two magnets - depending on position of their poles - can mutually be drawn or make a start. If the wire on which the electric current proceeds, pushes away a constant magnet in the form of a magnetic needle, the Ampere the wire should be some kind of a magnet argued. And if so two wires on which proceed electric currents, too should influence against each other mechanical forces, like constant magnets.

This reasoning proved matematicheski, has appeared correct.

Ampere Opening has soon suggested that it is possible to increase repeatedly mechanical action of magnetic forces, concentrating them by wire winding on the coil. Further it has appeared that the electromagnet with the metal core makes action stronger, than the coil without the metal core.

These supervision of the big practical importance are used and in the further researches.

It is necessary to add still that is direct behind opening of Ersteda and Ampere the invention of the device for electric current measurement has followed. It was the magnetic needle placed in the coil which deviated that more than more strongly the current proceeded on the coil. German Shvejger was the inventor of the device named a galvanometre.

Opening and Ampere reasonings had not only practical, but also theoretical value. Mutual influence of currents so differed from before known electric phenomena that the Ampere named these new phenomena electrodynamic and has suggested to divide a science about an electricity into an electrostatics and electrodynamics. Magnetism, according to Ampere, did not make separate section of physics, and was electrodynamics base.