# Physics Quicksheets - Magnetism

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 Author: awc1990 ID: 227424 Filename: Physics Quicksheets - Magnetism Updated: 2013-07-17 13:53:38 Tags: Physics Quicksheets Magnetism Folders: Description: Kaplan Quicksheets Chapter 7 Show Answers:

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1. The Magnetic Field

Magnetic Fields are created by permanent magnets and moving charges.

*magnetic field lines depict the direction a compass needle would point if placed in the field from the North Pole to the South Pole

SI units = Tesla (T) = N*s/m*C

1 T = 104 gauss
2. Magnetic Materials:

1. Diamagnetic
materials made of atoms with no unpaired electrons and that have no net magnetic field.

*weakly antimagnetic
3. Magnetic Materials:

2. Paramagnetic
materials have unpaired electrons and have a net magnetic dipole, but the atoms in these materials are usually randomly oriented so that the material itself creates no magnetic field.

*weakly magnetized in the presence of an external magnetic field.
4. Magnetic Materials:

3. Ferromagnetic
materials have unpaired electrons and permanent atomic magnetic dipoles that are normally oriented randomly so that the material has no net magnetic dipole.

*will become strongly magnetized when exposed to a magnetic field or under certain temperatures.

• *Curie Temperature:
•                  above = paramagnetic
•                  below = permanently magnetized
5. Force on a Moving Charge
A charge moving in a magnetic field experieces a force exerted on it.

• q = charge (+/-)
• v = velocity
• B = Magnetic Field

*the magnetic force is zero when a charge moves parallel or antiparallel to the magnetic field

*@ sin(900): F = qvB = mv
6. Right-Hand Rule for Finding Direction of Force

*Note that the right-hand Rule gives the direction of magnetic force exerted on a proton.

The direction of force on an electron is simply the opposite direction of the force on a proton.
7. Force on a Current-Carrying Wire
F = iLBsinθ

x --> represents B fields pointing into the page.

* --> represents B fields pointing out of the page.
8. Center of Wire Loop - Magnetic Force
9. Around a Straight Wire - Magnetic Force
10. Right-Hand Rule for Direction of B Field produced by Current-Carrying Wires

*right thumb points in the direction of current flow.

*Wrap your fingers around the wire as if you were grabbing it with your palm

*The direction that the fingers curl is the direction of the magnetic field.
11. Wave Superposition

*Waves can also be shifted with respect to one another by other fractions of a cycle, such as λ or 90o out of phase.

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