# Field Around Magnet Use a compass to map the direction of the magnetic field surrounding a magnet. White board your results. In particular: how does the.

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Field Around Magnet Use a compass to map the direction of the magnetic field surrounding a magnet. White board your results. In particular: how does the strength of the field vary with distance from the wire? how does the field direction relate to the poles of the magnet? General Physics 2 Magnetism

Activity: Map Field of Magnets
Use iron filings to map the field of a bar magnet horseshoe magnet White board results draw field lines. how might magnets generate magnetic fields? General Physics 2 Magnetism

Magnetic Field Lines direction of magnetic field, B, is parallel to field line number of lines per area is proportional to strength of field field lines point from N to S field lines form closed loops General Physics 2 Magnetism

Magnetism No magnetic monopoles! General Physics 2 Magnetism

Magnets are similar to Electric Dipoles
General Physics 2 Magnetism

Ferromagnetism Ferromagnetic material Preferentially Random downwards
iron or other materials that can be made into magnets You can make a magnet from iron by placing it in a strong B field individual domains become aligned with external B field Loss of magnetism from: dropping heating Curie temperature 1043 K for iron Preferentially downwards Random General Physics 2 Magnetism

Cross Product – Right Hand Rule
General Physics 2 Magnetism

Specifying 3 Dimensions
out of page tip of arrow into page tail of arrow General Physics 2 Magnetism

Force on a moving charge
Right Hand Rule (#2) qv = fingers B = bend fingers F = thumb Find the direction of the force on a negative charge for each diagram shown. General Physics 2 Magnetism

General Physics 2 Magnetism

Think-Pair-Share Derive an expression for the radius of an e-’s orbit in a uniform B field. Express your answer in terms of me, v, qe, and B. Turn in your solution! Start of class 2 - students have already completed worksheets 1 & 2 General Physics 2 Magnetism

Earth’s Magnetic Field
magnetic declination angular difference between geographic north and magnetic north varies with latitude General Physics 2 Magnetism

Practice Problems Magnetism: Worksheets 1 & 2 Finish before next class
General Physics 2 Magnetism

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