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Let’s start with the most visible type of electromagnetic radiation: visible light … googletag.cmd.push(function() { googletag.display("div-gpt-ad-1527869606268-7"); }); In case of relays, the magnetic field produced caused the plunger movement so that contacts get closed or opened and in motors this field causes the motor to rotate in a specific direction. The EM energy is clean. Visible Light Waves. Alarming systems use electrical bells which works based on electromagnetic principle. Magnetic card reader on the doors reads the number of keys stored in the magnetic tape of the card. The electromagnets will be demagnetized when the striker get contact with bell and by the spring tension striker comes back to its original position and again electrical contact will be made once again. The motor has a switch that continuously switches the polarity of the outside of motor. This process repeats until the switch gets opened. 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Electric Lawn Mowers Although all current carrying conductors produce magnetic fields, an electromagnet is specially constructed to maximize the strength of the magnetic field for a specific function. The above figure shows the EMS magnetic levitation system in which electromagnets are attached to the body of the train and are powered by the batteries in the train. If the current is varied at the same frequencies of the sound waves, results a vibration of the speaker which will further create sound waves. Raspberry Pi Books As long as the coil is energized, iron striker gets attracted by it, hence it strikes the bell. The strength of the magnetic flux depends on the current flowing through the electromagnet and the number of turns wounded on it. 2. my whole homework is finished here . RF range frequencies are mostly used in medical applications. 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