What is electromagnetic induction?
electromagnetic induction is when the current is induced in the wire due to the changing external magnetic field. This is the result of the magnetic force on the free electrons in the material. The size of the force depends on how quickly the magnetic field changes. If it is the result of a moving magnet, then the force is proportional to how fast the magnet moves. Stationary or constant magnetic fields do not indicate current.
When an electrical current flows through a conductive object, such as a wire, a magnetic field is created. This magnetic field is created around the wire and its strength depends on the amount of current. The opposite of this phenomenon is an electromagnetic induction in which the current is induced in a wire or other conductive material with a changing magnetic field. If a person moves the magnet towards Wire, then the current is created in a certain direction. Magnet shifting from the wire induces the current in the opposite direction. However, if the magnet is stationary next to the wire, no current is induced.
electromagnetic induction is possible due to electrons in the wire or other conductive material. When the magnet moves, the associated magnetic field moves with it. Free electrons in the wire that are negatively charged feel the power of the magnet that causes it to flow. From a mathematical point of view, the size of the force on the electrons is proportional to the speed of the magnetic field. That is why stationary magnets do not cause current - because in this situation the rate of change is zero.
If the magnet moves in one direction towards the wire, the current flows in one direction. This is known as direct current (DC). However, alternating curly (AC) is often more useful and is a type of current used in modern electrical networks. To induce the AC current, the magnet can be moved towards the conductor and from the conductor in cyclic movement.
There are a number of practical applications for electromagnetic induction. For example, guitars sensors sometimes use electromagnetic induction to detectvibration and their transformation into electric current. Other applications include induction engines, electric generators and induction cookers.