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Magnetism (3, Review)

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Page 1: Magnetism (3, Review). Like poles repel Unlike poles attract

Magnetism (3, Review)

Page 2: Magnetism (3, Review). Like poles repel Unlike poles attract

Like poles repel

Unlike poles attract

Page 3: Magnetism (3, Review). Like poles repel Unlike poles attract

Magnetic Field Lines vs. Electric Field Lines

Magnetic Dipole Electric Dipole

Page 4: Magnetism (3, Review). Like poles repel Unlike poles attract

What happens when you bring a compass near a bar magnet?

The north indicator of the compass will point toward the south pole of a magnet.

This is also why a compass points north, it's lining up with the earth's magnetic poles.

Page 5: Magnetism (3, Review). Like poles repel Unlike poles attract

Source of Magnetic Fields• Electrical Charge in motion.

– Currents occur at the atomic level in atoms due to the orbits of electrons around the nucleus.

– The intrinsic spin (+1/2, -1/2) is critical in the case of magnetism.

Page 6: Magnetism (3, Review). Like poles repel Unlike poles attract

Moving Charges in a magnetic Field

•Magnetic fields cause moving charges to curve

•http://homepages.ius.edu/kforinas/physlets/magnetism/magnetH.html

•http://www.youtube.com/watch?v=thtrYYoI7AM

Page 7: Magnetism (3, Review). Like poles repel Unlike poles attract

Field around a wire• http://www.launc.tased.edu.au/online/

sciences/physics/Lenz%27s.html

• Demo!

Page 8: Magnetism (3, Review). Like poles repel Unlike poles attract

Lenz’s Law• http://www.launc.tased.edu.au/online/

sciences/physics/Lenz%27s.html

• Demo!

Page 9: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•Describe the forces acting on this floating magnet

Page 10: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•What are the vector and non-vector quantities related to magnetism?

Page 11: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•Draw bar magnets and field lines as follows:

•N-N

•N-S

•S-S

Page 12: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•:Draw a horseshoe magnet

Page 13: Magnetism (3, Review). Like poles repel Unlike poles attract

QuestionsDraw a wire with a current

•Show the field lines

Page 14: Magnetism (3, Review). Like poles repel Unlike poles attract

QuestionsAdd compasses to all drawings above

http://www.magnet.fsu.edu/education/tutorials/index.html

Page 15: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•How do you produce a magnetic field?

•Describe the forces acting on this floating magnet

•What are the vector and non-vector quantities related to magnetism?

•Draw bar magnets and field lines as follows:

•N-N

•N-S

•S-S

•Draw a horseshoe magnet

•Draw a wire with a current

•Show the field lines

Add compasses to all drawings above

http://www.magnet.fsu.edu/education/tutorials/index.html

Page 16: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•Draw a wire moving through a magnetic field

•What is equation?

•Show direction of induced current

Page 17: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•Draw a wire moving through a magnetic field

•What is equation?

•Show direction of induced current

•EMF

Page 18: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions

•Draw a wire with a current in a magnetic field

•What is equation?

•What are the forces acting on the wire?

Page 19: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions

•Draw a beam of protons moving through a magnetic field

•What is equation?

•Show the forces

•What if the velocity is increased?

Page 20: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•Draw a wire moving through a magnetic field

•What is equation?

•EMF

•Show direction of induced current

•Draw a wire with a current in a magnetic field

•What is equation?

•What are the forces acting on the wire?

•Draw a beam of protons moving through a magnetic field

•What is equation?

•Show the forces

•What if the velocity is increased?

Page 21: Magnetism (3, Review). Like poles repel Unlike poles attract

Questions•Draw a wire in a magnetic field

•Show the direction to produce maximum potential difference

•Show a direction to produce no potential difference


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