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  2. EMF measurement - Wikipedia

    en.wikipedia.org/wiki/EMF_measurement

    An EMF meter is a scientific instrument for measuring electromagnetic fields (abbreviated as EMF). Most meters measure the electromagnetic radiation flux density (DC fields) or the change in an electromagnetic field over time (AC fields), essentially the same as a radio antenna, but with quite different detection characteristics.

  3. Ghost hunting - Wikipedia

    en.wikipedia.org/wiki/Ghost_hunting

    EMF meter Used to detect possibly unexplained fluctuations in electromagnetic fields. The Safe Range EMF brand of meter, designed for use with power lines and household appliances, became popular after the Ghost Hunters television series claimed it to be "specially calibrated for paranormal investigators".

  4. Radio-frequency identification - Wikipedia

    en.wikipedia.org/wiki/Radio-frequency_identification

    When triggered by an electromagnetic interrogation pulse from a nearby RFID reader device, the tag transmits digital data, usually an identifying inventory number, back to the reader. This number can be used to track inventory goods. [1] Passive tags are powered by energy from the RFID reader's interrogating radio waves. Active tags are powered ...

  5. The Best Radio Frequency Detectors to Buy Right Now - AOL

    www.aol.com/news/best-radio-frequency-detectors...

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  6. Electromotive force - Wikipedia

    en.wikipedia.org/wiki/Electromotive_force

    The electromotive force generated by motion is often referred to as motional emf. When the change in flux linkage arises from a change in the magnetic field around the stationary conductor, the emf is dynamically induced. The electromotive force generated by a time-varying magnetic field is often referred to as transformer emf.

  7. Electromagnetic field - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_field

    An electromagnetic field (also EM field) is a physical field, mathematical functions of position and time, representing the influences on and due to electric charges. [1] ...

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