Physics Quicksheets - Magnetism
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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
materials made of atoms with no unpaired electrons and that have no net magnetic field.
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.
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
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
): F = qvB = mv
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.
Force on a Current-Carrying Wire
F = iLBsinθ
x --> represents B fields pointing into the page.
* --> represents B fields pointing out of the page.
Center of Wire Loop - Magnetic Force
Around a Straight Wire - Magnetic Force
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.
*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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