Electromagnetism
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This document discusses electromagnetism and its applications. It explains that a moving electric charge creates magnetic fields and changing magnetic fields create electric charges. It describes how coils of wire and electric currents are used to create electromagnets. It also discusses how changing magnetic fields produce electric fields and vice versa. Finally, it provides some examples of applications of electromagnetism like electric motors, dumping cars, loudspeakers, MRI, communication systems, radar, and medical imaging.
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The document discusses electromagnetism and electromagnetic induction. It explains that opposite magnetic poles attract while like poles repel. It also describes how electromagnets work by creating a magnetic field when an electric current flows through a wire coiled into a solenoid. Increasing the number of coils or the current strengthens the magnetic field. Electromagnets have many uses including in electric bells, sorting scrap metal, and speakers. The document also discusses electromagnetic induction and how a changing magnetic field can induce a voltage in a conductor.
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1. When a current-carrying wire passes through a magnetic field perpendicular to it, the wire experiences a force perpendicular to both the wire and the magnetic field. Reversing either the current or the magnetic field reverses the direction of the force.
2. A coil carrying a current in a magnetic field experiences a turning force due to the interaction between the magnetic fields. In a DC motor, this principle is used to convert electrical energy to mechanical motion as the turning coil is connected to a power source via a split-ring commutator.
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3. Near airports - Tall pylons and cables could pose a collision hazard for planes during takeoff and landing.
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This document discusses electromagnetism and electromagnetic induction. It explains that electricity and magnetism are two aspects of electromagnetism, with changing electric fields producing magnetic fields and vice versa. This connection was first established by Faraday and Maxwell. Various applications of electromagnetic waves are covered, including radio waves, microwaves, infrared, visible light, X-rays, and gamma rays. The document also discusses how changing magnetic fields can induce electric currents and the generation and reception of radio waves through oscillating electric charges and antennas.
18_electromagnetism.ppt
This document discusses electromagnetism and electromagnetic induction. It explains that electricity and magnetism are two aspects of electromagnetism, with changing magnetic fields producing electric currents and vice versa. This connection was first established by Faraday and Maxwell. Various applications of electromagnetic waves are covered, including radio waves, microwaves, infrared, visible light, X-rays, and gamma rays. The document also discusses how changing electric and magnetic fields propagate through space as electromagnetic radiation traveling at the speed of light.
18_electromagnetism (2).ppt
This document discusses electromagnetism and electromagnetic induction. It explains that electricity and magnetism are two aspects of electromagnetism, with changing magnetic fields producing electric currents and vice versa. This connection was first established by Faraday and Maxwell. Various applications of electromagnetic waves are covered, including radio waves, microwaves, infrared, visible light, X-rays, and gamma rays. The document also discusses how changing electric and magnetic fields propagate through space as electromagnetic radiation traveling at the speed of light.
18_electromagnetism.ppt
This document discusses electromagnetism and electromagnetic induction. It explains that electricity and magnetism are two aspects of electromagnetism, with changing electric fields producing magnetic fields and vice versa. This connection was first established by Faraday and Maxwell. Various applications of electromagnetic waves are covered, including radio waves, microwaves, infrared, visible light, X-rays, and gamma rays. The document also discusses how changing magnetic fields can induce electric currents and the generation and reception of radio waves through oscillating electric charges and antennas.
orientation ppt emwtl .ppt
This document discusses electromagnetic fields and waves. It begins by defining electromagnetics and some key concepts like electrostatics, magnetostatics, and electromagnetic waves. It then explains how changing electric and magnetic fields produce each other through Faraday's law and discusses transformers as an example. The document also discusses electromagnetic waves, how they are produced by vibrating charges, and their ability to transfer energy through electric and magnetic fields. It provides examples of different electromagnetic frequencies and their applications like radio, TV, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. In closing, it lists some objectives and outcomes of studying electromagnetics.
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ELECTROMAGNETISM Electromagnetic Induction Electromagnetic Waves
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Electromagnetism
- 2. Introduction Magnetic fields from electricity Electromagnets Induced Current The Electromagnetic Connection Applications of Electromagnetism Electromagnetic radiations Effects control conclusion
- 3. Introduction ◦ a moving electric charge produces magnetic fields ◦ changing magnetic fields move electric charges Faraday, Maxwell Einstein
- 4. Magnetic fields from electricity: Charges in motion (an electrical current) produce a magnetic field
- 5. Arranging wire in a coil and running a current produces a magnetic field that looks like a bar magnet called an electromagnet.
- 7. A changing magnetic field produces an electric field, and vice versa. Both electric and magnetic fields can transport energy ◦ Electric field energy used in electrical circuits, e.g., released in lightning ◦ Magnetic field carries energy through transformer.
- 10. PRO meter ELF meter Gigahertz ME3030b meter.
- 11. Electric motors:
- 12. Dumping cars:
- 13. Loudspeaker:
- 15. Interrelated electric and magnetic fields traveling through space
- 16. Communication systems Radar Medical Imaging (X rays) Astronomy (radio, wave, IR, visible, UV, gamma)
- 19.