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Chapter 19 Magnetism

Chapter 19 Magnetism. Honors Physics Lecture Notes. Thursday May 10 th. Magnetism. Thursday, May 10. TODAY’S AGENDA. Magnetic Fields of Current Loops and Solenoids. UPCOMING…. Fri: AWARDS DAY Mon: Review Tues: TEST 3 Wed: Lab due. Magnetism. Sections.

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Chapter 19 Magnetism

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  1. Chapter 19 Magnetism Honors Physics Lecture Notes

  2. Thursday May 10th Magnetism

  3. Thursday, May 10 TODAY’S AGENDA • Magnetic Fields of Current Loops and Solenoids UPCOMING… • Fri: AWARDS DAY • Mon: Review • Tues: TEST 3 • Wed: Lab due

  4. Magnetism Sections Magnetic Fields of Current Loops and Solenoids

  5. Motion of a Charged Particle in a Magnetic Field v q F B Momentum If a charged particle is moving perpendicular to a uniform magnetic field, its path will be a circle.

  6. Motion of a Charged Particle in a Magnetic Field What is the velocity of a beam of electrons that go undeflected when passing through perpendicular electric and magnetic fields of magnitude 8.8 x 103 V/m and 3.5 x 10-3 T, v respectively? What is the radius of the electron orbit if the electric field is turned off? me = 9.1 x 10-31kg qe = 1.6 x 10-19C undeflected means B and E are equal and opposite F = Eq F = qvB Eq = qvB E/B = v r = mv/qB mv2/r = qvB

  7. Magnetism The diagram below shows an electron, e, located in a magnetic field. There is no magnetic force on the electron when it moves (A) toward the right side of the screen (B) toward the top of the screen (C) into the screen (D) out of the screen

  8. Magnetism A vertical wire carries a current straight down. To the east of this wire, the magnetic field points (A) north. (B) east. (C) south. (D) down.

  9. Magnetic Fields of Current Loops and Solenoids The direction of the field is given by a right-hand rule.

  10. Magnetic Fields of Current Loops and Solenoids I I N B L A solenoid is a long coil of wire. If it is tightly wrapped, the magnetic field in its interior is almost uniform:

  11. Magnetism The diagram below shows an electromagnet made from a nail, a coil of insulated wire, and a battery. The south pole of the electromagnet is located closest to point (A) A (B) B (C) C (D) D

  12. END

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