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D2L Lesson 1: Magnetic Fields - Physi x L7 + V X C A d21.cbe.ab.ca/content/enforced/940046-cbel2122winphysics30slkrausnick 1/Video_notes_blank/M4L1.pdf?_&d21SessionVal=Wx8pUOsPsCISQ8aaEanc99zmD&ou=940046 0 A L7 2 / 6 - 76% + Examples of magnetic field lines: Field Source Symbol Unit Direction Gravitational Electric 2 Magnetic Earth's Magnetic Field S 3 F N N ENG 1:10 PM US qX O 2022-04-08 21D2L Lesson 1: Magnetic Fields - Physi x L7 + V X C A d21.cbe.ab.ca/content/enforced/940046-cbel2122winphysics30slkrausnick1/Video_notes_blank/M4L1.pdf?_&d21SessionVal=Wx8pUOsPsCISQ8aaEanc99zmD&ou=940046 0 A L7 3/ 6 | - 76% + Part 2: Induced Magnetic Fields in wires In 1820, Hans Christian Orsted discovered the link between electricity and magnetism during a lecture. He set up a wire carrying electric current and noticed that a compass needle moved when the current was turned off and on. Orsted's discovery: Hand rules: Used to find the direction of vectors in magnetism Left hand Right Hand 2 Electron flow vs. conventional current: 3 TIT F N ENG 1:10 PM US qX O 2022-04-08 21D2L Lesson 1: Magnetic Fields - Physi x L7 + V X C A d21.cbe.ab.ca/content/enforced/940046-cbel2122winphysics30slkrausnick1/Video_notes_blank/M4L1.pdf?_&d21SessionVal=Wx8pUOsPsCISQ8aaEanc99zmD&ou=940046 0 A L7 4 / 6 - 70% + First Hand Rule: Use to determine the direction of the magnetic field around a wire carrying current. Example: electron flow conventional Current 2 Example: electron flow electron flow -O- 3 New vector directions: Into the page Out of the page Example: electron flow N ENG 1:10 PM US qX O 2022-04-08 21D2L Lesson 1: Magnetic Fields - Physi x L7 + V X C d21.cbe.ab.ca/content/enforced/940046-cbel2122winphysics30slkrausnick1/Video_notes_blank/M4L1.pdf?_&d21SessionVal=Wx8pUOsPsCISQ8aaEanc99zmD&ou=940046 0 A L7 5 / 6 | - 70% + Example: (current is electron flow) 2 1 1 Part 3: Induced Magnetic Fields Around Solenoids E If a current carrying wire is looped, the magnetic field will spiral around it. The result is that the magnetic field is one direction inside the loop and the other direction outside. 3 (a) This is magnified if you add more loops. A solenoid is a type of electromagnetic that is made from a 4 series of looped wires 11 + TI VV 5 N ENG 1:10 PM US qX O 2022-04-08 21D2L Lesson 1: Magnetic Fields - Physi x L7 + V X C d21.cbe.ab.ca/content/enforced/940046-cbel2122winphysics30slkrausnick1/Video_notes_blank/M4L1.pdf?_&d21SessionVal=Wx8pUOsPsCISQ8aaEanc99zmD&ou=940046 0 A L7 6 / 6 | - 70% + Second Hand Rule: Gives the direction of a magnetic field of a solenoid thumb points to N-pole 3 fingers indicate current direction Example: Will these solenoids attract or repel? 4 +A + IT Example: Draw the magnetic field inside and outside the solenoid + 5 6 ENG 1:11 PM US qX O 2022-04-08 21D2L Lesson 1: Magnetic Fields - Physi x L7 + V X C d21.cbe.ab.ca/content/enforced/940046-cbel2122winphysics30slkrausnick1/Video_notes_blank/M4L1.pdf?_&d21SessionVal=Wx8pUOsPsCISQ8aaEanc99zmD&ou=940046 0 A L7 1 / 6 | - 76% + Module 4 Lesson 1: Magnetic Fields Part 1: Introduction to magnetism A magnet is made up of a north pole and a south pole You can't have an isolated north or south pole -> they always come together Magnetic Forces 2 Fm is attractive for unlike poles Fm is repulsive for like poles Magnetic forces are action at a distance forces (like electric and gravitational forces) so they can be 3 explained by magnetic fields A magnetic pole in a magnetic field will always experience a force (attractive or repulsive depending on the type of pole) Direction of magnetic field: F O N ENG 1:09 PM US qX O 2022-04-08 20