electromagnet

(noun)

A magnet which attracts metals only when electrically activated.

Related Terms

Examples of electromagnet in the following topics:

  • The Production of Electromagnetic Waves

    • Electromagnetic waves are the combination of electric and magnetic field waves produced by moving charges.
    • Electromagnetic radiation, is a form of energy emitted by moving charged particles.
    • The creation of all electromagnetic waves begins with a charged particle.
    • These and many more such devices use electromagnetic waves to transmit data and signals.
    • Electromagnetic waves are a self-propagating transverse wave of oscillating electric and magnetic fields.

  • Electromagnetic Spectrum

    • The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation.
    • The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation.
    • The electromagnetic spectrum of an object has a different meaning: it is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.
    • Whenever electromagnetic waves exist in a medium with matter, their wavelength is decreased.
    • The behavior of electromagnetic radiation depends on its wavelength.

  • Solenoids, Current Loops, and Electromagnets

    • Solenoids are important because they can create controlled magnetic fields and can be used as electromagnets.
    • Electromagnetism is the use of electric current to make magnets.
    • These temporarily induced magnets are called electromagnets.
    • Combining a ferromagnet with an electromagnet can produce particularly strong magnetic effects.
    • An electromagnet creates magnetism with an electric current.

  • Introduction to Light Energy

    • The sun emits an enormous amount of electromagnetic radiation (solar or light energy).
    • The electromagnetic spectrum is the range of all possible frequencies of radiation .
    • The electromagnetic spectrum shows several types of electromagnetic radiation originating from the sun, including X-rays and ultraviolet (UV) rays.
    • Each type of electromagnetic radiation travels at a particular wavelength.
    • The sun emits energy in the form of electromagnetic radiation.

  • Maxwell's Predictions and Hertz' Confirmation

    • Maxwell's prediction of the electromagnetic force was confirmed by Hertz who generated and detected electromagnetic waves.
    • The propogation of an electromagnetic wave as predicted by Maxwell and confirmed by Hertz.
    • The apparatus used by Hertz in 1887 to generate and detect electromagnetic waves.
    • An RLC circuit connected to the first loop caused sparks across a gap in the wire loop and generated electromagnetic waves.
    • Explain how Maxwell's prediction of the electromagnetic force was confirmed by Hertz

  • The Electromagnetic Spectrum

    • This electromagnetic spectrum ranges from very short wavelengths (including gamma and x-rays) to very long wavelengths (including microwaves and broadcast radio waves).

  • Photon Energies of the EM Spectrum

    • The electromagnetic (EM) spectrum is the range of all possible frequencies of electromagnetic radiation.
    • The electromagnetic (EM) spectrum is the range of all possible frequencies of electromagnetic radiation .
    • Maxwell's equations predicted an infinite number of frequencies of electromagnetic waves, all traveling at the speed of light.
    • This was the first indication of the existence of the entire electromagnetic spectrum.
    • The last portion of the electromagnetic spectrum was filled in with the discovery of gamma rays.

  • Energy and Momentum

    • Electromagnetic waves have energy and momentum that are both associated with their wavelength and frequency.
    • Electromagnetic radiation can essentially be described as photon streams.
    • Planck theorized that "black bodies" (thermal radiators) and other forms of electromagnetic radiation existed not as spectra, but in discrete, "quantized" form.
    • In other words, there were only certain energies an electromagnetic wave could have.
    • Relate energy of an electromagnetic wave with the frequency and wavelength

  • Ferromagnets and Electromagnets

    • There are two type of magnets—ferromagnets that can sustain a permanent magnetic field, and electromagnets produced by the flow of current.
    • In the second class of magnets—known as electromagnets—the magnetic field is generated through the use of electric current.
    • In an electromagnet the magnetic field is produced by the flow of electric current.
    • This is called a ferromagnetic-core or iron-core electromagnet.
    • A simple electromagnet consisting of a coil of insulated wire wrapped around an iron core.

  • Microwaves

    • Microwaves are electromagnetic waves with wavelengths ranging from one meter to one millimeter (frequencies between 300 MHz and 300 GHz).
    • Super high frequency (SHF) is the designation for electromagnetic wave frequencies in the range of 3 GHz to 30 GHz.
    • Microwaves are the highest-frequency electromagnetic waves that can be produced by currents in macroscopic circuits and devices.
    • The electromagnetic spectrum, showing the major categories of electromagnetic waves.
    • Distinguish three ranges of the microwave portion of the electromagnetic spectrum