Magnetism Physics Ms. Allison

Agenda Engagement Lecture Demonstrations Independent class work Exploration Closing

College Lecture What can you record about magnetism? Watch video Record notes about important details Magnetism Summary

What is Magnetism? Caused by moving electric charges Charges interact with BOTH electric and magnetic fields 3 ways magnets can be created

What about Magnetic Domains? Microscopic clusters of aligned atoms Align the atoms and make a new magnet

What are Magnetic poles One region on a magnet that produces magnetic forces North and south poles of every magnet Opposite poles attract while like poles repel Poles cannot be isolated

What are Magnetic fields? A force field around every magnet or current carrying wire Produced by motion of electric charges Strongest near the magnet Lines usually drawn from north to south

What is an electromagnet? A current carrying wire with many loops Magnetic fields exert a force on moving electrons in a loop The magnetic field is strongest in the center of the loop Make with a wire, battery and nail

Solving for magnetic force and field Magnetic field = force (charge)(speed) B = F qv

Did you know the Earth is a magnet? Currents in molten part of Earth Convection currents from heat of Earth’s core Not stable

Magnets in today’s world Cell phones Strips within cards High speed trains

Closing How can one make a magnet? What happens to the electrons if a magnet exist or is made?

Homework Write 5 questions (with answers) about Magnetism