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Electromagnetism By Tyler Trodden and Dylan Tragni What is Electromagnetism? • Electromagnetism is one of the four fundamental interactions of nature, along with strong interaction, weak interaction and gravitation. It is the force that causes the interaction between electrically charged particles; the areas in which this happens are called electromagnetic fields. Information • Electric charges attract or repel one another with a force inversely proportional to the square of the distance between them: unlike charges attract, like ones repel. The Left Hand Rule • The first left hand rule is a method you can use to determine the direction of conventional current. Keep your thumb pointed in the direction of conventional current. How to: • Using your left-hand: Curl your fingers into a half-circle around the wire, they point in the direction of the magnetic field, B Point your thumb in the direction of the conventional current. • The First finger represents the direction of the magnetic Field. (north to south) • The Second finger represents the direction of the Current. • The Thumb represents the direction of the Thrust or resultant Motion. Examples • http://www.stmary.ws/highschool/physics/ho me/animations3/magnetism/1stLeftHandRule .html • Http://www.stmary.ws/highschool/physics/ho me/animations3/magnetism/2nd_left_rule.ht ml • http://www.stmary.ws/highschool/physics/ho me/animations3/magnetism/3rd_left_rule.ht ml Definitions • Solenoid- a long coil of wire consisting of many loops. • Electromagnet- the current carrying coil which has a north and south pole. The Easy Test 1) A long coil of wire consisting of many loops is a 2) The current carrying coil which has a north and south pole is 3) One of the four fundamental interactions of nature, along with strong interaction, weak interaction and gravitation is 4) A method you can use to determine the direction of conventional current is called the 5) Represents the direction of the thrust or resultant motion is the Quiz • http://www.stmary.ws/highschool/physics/ho me/marys_java/magnetism/MagnetismQ.htm l Bibliography • • • • St. Mary’s Physics Textbook Wikipedia Google Images Electromagnetism and Magnetic Induction By Tom Sullivan and Steve Lyons The Basics of Magnetic Induction • Technical Details • Uses of Magnetic Induction in Applications Technical Details • Magnetic Induction is the production of *voltage across a conductor situated in a changing magnetic field or a stationary magnetic field*. • *Magnetic fields are associated with magnets.* • An electric current will be induced in any closed circuit when the magnetic flux through a surface bounded by the conductor changes. Uses of Magnetic Induction in Applications • • • • • Induction Sealing Electrical Generators Transformers Contactless recharging of batteries Faraday Flashlight (Faraday was a physicist and chemist. He discovered the induction phenomenon in *1831*.) • Graphics Tablet • Clamp Meter Quiz 3. Magnetic fields are associated with _______. 4. Magnetic Induction is the production of ________. 5. Michael Faraday discovered the induction phenomenon in ____. (Hint: minus 1111 from 2942) Quiz Answers • 3.) Magnets • 4.) Voltage across a conductor situated in a changing magnetic field or a stationary magnetic field • 5.) 1831