Induction inside conductors and coils. Eddy currents and their uses, self-induction and the inductance of a solenoid, mutual induction, and the energy stored in an inductor.
3 lessons, about 1 h 55 min3 simulations11 problems9 practice questionsPython in every lesson
Created by StemPy LabA changing magnetic flux drives swirling currents through a solid piece of metal. These eddy currents oppose the change that makes them. They brake a moving conductor, and they heat the metal. Slots and thin insulated sheets cut them down, and an induction cooker uses them on purpose.
A coil has a magnetic field of its own, and the flux of that field passes through its own turns. So the coil resists a change of its own current. The flux linkage is , the emf is , and the unit of is the henry. A long solenoid has .
Two coils that share flux are linked. A changing current in one makes an emf in the other, . The coupling coefficient is . Building up a current in an inductor stores the energy in its magnetic field, and each cubic metre of field holds .
Log in to join the discussion.
Loading…