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A current can be induced in a conducting loop if it is exposed to a changing magnetic field.
Get the swing of electromagnetic induction with this simple tutorial.
Like resistance, reactance slows an electrical current down. Explained by Lenz's Law, this phenomenon occurs only in AC circuits.
This tutorial is a three-dimensional simulation of a cathode ray oscilloscope producing Lissajous figures as it compares sinusoidal voltages.
In ferromagnetic materials, smaller groups of atoms band together into areas called domains, in which all the electrons have the same magnetic orientation. That's why you can magnetize them. See how it works in this tutorial.
Whenever current travels through a conductor, a magnetic field is generated.
A handful of iron filings helps visualize the invisible magnetic field that circulates around a wire with a current running through it.
You can create a stronger, more concentrated magnetic field by taking wire and forming it into a coil called a solenoid.
Magnetic shunts are often used to adjust the amount of flux in the magnetic circuits found in most electrical motors.
The mass spectrum of a material, deduced using a machine called a mass spectrometer, reveals how many isotopes of a given element are to be found in the material. See here what these spectra look like and how they are useful.