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  • magnetic domains

    a region composed of a group of atoms whose magnetic fields are aligned in the same direction

    magnetic field

    a region where a magnetic force can be detected

    solenoid

    a coil of wire with an electric current in it

    North (N) to South (S)

    field lines drawn from

    50μT

    magnetic strength of the earth

    Lodestone

    First discovered magnet by ancient Greeks

    temporary magnet

    Magnets can polarize non-magnetic materials - making a

    Permanent magnets

    are created from other magnets - its atomic structure makes it "hold" its magnetism

    aluminum, nickel, and cobalt (called ALNICO)

    Many permanent magnets are made of a combination of

    tiny electromagnet

    Each electron in a magnet acts like a

    domains

    Electrons are grouped together in

    Unmagnetized

    _____ domains are randomly arranged

    Magnetized domains

    are electrons spinning in the same direction

    polarized

    magnets are _____ they have two opposite ends, North and South

    attract

    Unlike poles

    repel

    Like poles

    Monopoles

    _____ don't exist

    south magnetic pole

    The geographic north pole of Earth is actually a

    distance

    Like electric charge, magnetic forces can work at a

    Magnetic Fields

    exist around the ends of a magnet

    Magnetic Fields

    Have both a magnitude and vector

    Magnetic Fields

    Drawn from N to S

    Magnetic Flux

    number of field lines per unit area and denotes field strength

    Magnetic Flux

    Helps define the strength of a magnetic field - number of field lines in a particular area around a magnetic

    Magnetic Flux

    ϕM = Aβcosθ

    phi

    represents magnetic flux

    A

    area of material generating magnetic field

    β

    magnetic field strength

    stronger

    A magnetic with a greater flux value is ______ than one with a lower flux value

    Hans Christian Oersted

    1820, _______ discovered that current in a wire moves a compass needle

    perpendicular

    The compass needle pointed_____ to the wire's current flow

    First Right-Hand Rule

    Used to determine the direction of a magnetic field

    Thumb

    ____ points in direction of current flow (first hand rule)

    The curl of your fingers

    _____ indicates magnetic field direction(first hand rule)

    walking & talking

    thumb does the ____ and fingers do the____ (first hand rule)

    Solenoids

    Coil of wire with many loops

    strong magnetic field

    Center of soleniod makes a _____, like that of a temporary magnet

    electromagnet

    The magnet created by this flow is called an

    stronger magnet

    Higher current =

    stronger magnetic field

    Increasing loops =

    magnetized

    A metal rod placed inside the coil will become

    Second Right-Hand Rule

    Determines the direction of a magnetic field created by a solenoid

    talking & walking

    thumb does the ____ and fingers do the ____ (Second Right-Hand Rule)

    magnetic field direction

    thumb shows____ (Second Right-Hand Rule)

    current flow

    fingers show _____(Second Right-Hand Rule)

    magnetic field

    Current in a wire causes

    forces

    Magnetic fields create

    perpendicular

    Forces on Currents in a Magnetic Field are all ____ to each other

    attracted/repelled

    Wires can then be

    repulsion

    Opposite current direction causes

    circular path

    A charge moving through a magnetic field follows a

    q

    charge (C)

    v

    velocity of the charge (m/s)

    β

    magnetic field (T)

    I

    current (A)

    l

    length of wire (m)

    Β

    magnetic field (T, tesla)

    Third Right Hand Rule

    Used to determine the force on a current-carrying wire in a magnetic field (β)

    β

    Index finger (Third Right Hand Rule)

    I

    Thumb (Third Right Hand Rule)

    F on the wire

    Middle finger/palm (Third Right Hand Rule)

    Third Right Hand Rule

    Only for positive charges

    Third Right Hand Rule

    gun positioning

    Circle with an X

    Force into the page

    Circle with a dot

    Force out of the page

    Galvanometers

    Measures small current

    Galvanometers

    Uses the force from the magnetic field produced by current in wire to move a needle for reading I or V

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