Visualizing magnetic fields sounds weird ... a North pole and green representing the South pole. Apparently, transformers and motors look really, really cool, and this is a perfect proof of ...

This magnetic field changes as the current changes ... The induced voltage causes an alternating current to flow. Transformers can only work with alternating current. Input and output voltages ...

The strength of the Earth’s magnetic field ranges between 25,000 and 65,000 nano-Tesla (nT) with values of 31-58,000 nT between the equator and 50 degrees latitude.

a primary potential difference drives an alternating current through the primary coil the primary coil current produces a magnetic field, which changes as the current changes the iron core ...

How a tokamak works: The electric field induced by a transformer drives a current (big red arrows) through the plasma column. This generates a poloidal magnetic field that bends the plasma current ...