Solve a rotating-coil electromagnetism problem by deriving the induced emf from changing magnetic flux. Learn how coil area, number of turns, rotation rate, and magnetic field strength set the emf ...

If you made a motor out of a magnet, a wire coil, and some needles, you probably remember that motors and generators depend on a rotating magnetic field. Once you know how it works, the concept is ...

For more than a century, engineers have chased new ways to turn the planet’s natural motions into usable power, from tides to ...

A magnetic field is the magnetic influence of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it ...

Researchers have found that exposing a certain class of particles -- micron-sized beads endowed with a special magnetic sensitivity -- to a rapidly alternating, rotating magnetic field causes them to ...

3D and cross-sectional views of an optimized Superconducting (SC)- Soft-Ferromagnetic bilayer (SFM) cloak. At the left no SFM is used showing the diamagnetic response of the SC. At the right the ...