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  2. Electromagnet - Wikipedia

    en.wikipedia.org/wiki/Electromagnet

    A portative electromagnet is one designed to just hold material in place; an example is a lifting magnet. A tractive electromagnet applies a force and moves something. [8] Electromagnets are very widely used in electric and electromechanical devices, including: Motors and generators; Transformers; Relays; Electric bells and buzzers ...

  3. Introduction to electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Introduction_to...

    In the lab frame, the electron is moving and so feels a magnetic force from the current in the wire but because the wire is neutral it feels no electric force. But in the electron's rest frame , the positive charges seem closer together compared to the flowing electrons and so the wire seems positively charged.

  4. List of electrical phenomena - Wikipedia

    en.wikipedia.org/wiki/List_of_electrical_phenomena

    Inductance — The phenomenon whereby the property of a circuit by which energy is stored in the form of an electromagnetic field. Induction heating — Heat produced in a conductor when eddy currents pass through it. Joule heating — Heat produced in a conductor when charges move through it, such as in resistors and wires.

  5. Electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Electromagnetism

    The electromagnetic force is one of the four fundamental forces of nature. It is the dominant force in the interactions of atoms and molecules. Electromagnetism can be thought of as a combination of electrostatics and magnetism, which are distinct but closely intertwined phenomena. Electromagnetic forces occur between any two charged particles.

  6. Classical electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Classical_electromagnetism

    Examples of the dynamic fields of electromagnetic radiation (in order of increasing frequency): radio waves, microwaves, light (infrared, visible light and ultraviolet), x-rays and gamma rays. In the field of particle physics this electromagnetic radiation is the manifestation of the electromagnetic interaction between charged particles.

  7. Ohm's law - Wikipedia

    en.wikipedia.org/wiki/Ohm's_law

    The temperatures at the sample contacts become different, their difference is linear in current. The voltage drop across the circuit includes additionally the Seebeck thermoelectromotive force which again is again linear in current. As a result, there exists a thermal correction to the sample resistance even at negligibly small current. [35]

  8. List of experiments - Wikipedia

    en.wikipedia.org/wiki/List_of_experiments

    Discovery of electromagnetic induction (1831): Michael Faraday discovers magnetic induction in an experiment with a closed ring of soft iron, with two windings of wire. Joule's experiment (1834):James Prescott Joule demonstrates the mechanical equivalent of heat, an important step in the development of thermodynamics.

  9. Magnetoresistance - Wikipedia

    en.wikipedia.org/wiki/Magnetoresistance

    The resistance of a thin Permalloy film is shown here as a function of the angle of an applied external field. Thomson's experiments [ 4 ] are an example of AMR, [ 7 ] a property of a material in which a dependence of electrical resistance on the angle between the direction of electric current and direction of magnetization is observed.