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  • magnetite

    term for a magnetic form of iron ore

    lodestone

    term used for any piece of magnetized rock since it had value in giving direction

    north (north-seeking) pole

    term for the end of a lodestone that gains a north-ward direction

    south (south-seeking) pole

    term for the end of a lodestone that gains a southward direction

    dipolar

    A magnetic pole is always paired with its opposite; thus, every magnet is ____.

    monopoles

    term for isolated north poles and south poles that might occur somewhere in nature

    law of magnetic poles

    the law that states that unlike poles attract whereas like poles repel

    contact and induction

    two ways to magnetize an object

    contact

    Magnetizing an object by stroking or touching it with an existing magnet is called magnetization by ____.

    induction

    Magnetizing an object by bringing it into the presence of an existing magnet is called magnetization by _____.

    keeper

    term for a piece of soft iron that can be placed across the poles at the end of each pair of magnets when they are put away

    temporary magnets

    term for iron magnets and other easily demagnetized magnets

    permalloy

    the best material to make a magnet rapidly gain and rapidly lose magnetization; an alloy of nickel and iron in approzimately a 3 to 1 ratio

    alnico

    term for an alloy of aluminum, nickel, cobalt, and iron in various proportions, of which many permanent magnets are made

    lines of flux

    term for lines on diagrams or drawings that show which ways the north and south poles point

    tangent

    The direction of field strength acting on an isolated north pole is _____ to a line of flux at every point.

    closed loops

    Lines of flux must be drawn as ___ ___.

    stronger

    The lines of flux are more concentrated where the magnetic field is ____.

    magnetic induction

    term for the field strength at a particular point in a magnetic field

    permeability

    The extent to which a material absorbs lines of flux is related to its _____, or how strongly it is magnetized by a magnetic field.

    magnetic insulators

    term for highly permeable materials that resist penetration by lines of flux

    spin magnet

    term for an electron that rotates on its own axis

    magnetic moment

    term for when an electron seems to spin but does not actually spin

    orbital magnets

    term for magnetic moment produced by electrons

    domain

    term for a small region containing billions or trillions of atoms with aligned magnetic poles

    saturation

    term for the spin axes of all the unpaired electrons pointing in the same direction

    diamagnetic

    term for a material that is repelled by a magnet

    paramagnetic

    term for a material that has only one unpaired elctron per atom, and is weakly attracted to a magnet

    ferromagnetic

    term for a material that is strongly attracted to a magnet because it has two or more unpaired electrons per atom

    conventional current

    term that describes electricity through a circuit as positive charges flowing from positive to negative

    True

    True or False: Electrons flow from negative to postive.

    Hans Oersted

    Danish physicist who found that an electric current affects the magnetic meedle of a compass

    right-hand rule

    the rule that states that if the thumb of the right hand is pointed along a conductor in the direction of positive current, the fingers encircle the conductor in the direction of the north-moving field

    solenoid

    term for a long series of adjacent loops in the form of a helix or a loose coil; becomes a magnet when current passes through the wire

    electromagnet

    term for a solenoid with a core of iron, permalloy, or similar material

    1.26 x 10^-6 N/A^2

    the value of the permeability constant for a vacuum

    ampere

    term for the current that, when flowing in each of two long, parallel conductors spaced one meter apart in a vacuum, would give rise to a force of exactly 2 x 10^7 N upon any meter length of either conductor

    coulomb

    term for the amount of charge that, in each second, passes a given point on the conductor

    right-handed three finger rule

    the rule that states that if you point your right thumb in the direction of positive current, your extended index finger points in the direction of magnetic induction

    left-hand rule

    the rule that says that negative current flows the oposite direction of positive current

    magnetic flux

    term for the total number of lines falling on any surface, or the total magnetic influence playing oupon a surface

    flux density

    another term for magnetic induction

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