42 Multiple choice questions
best material to make a magnet rapidly gain and rapidly lose
magnetization; an alloy of nickel and iron in approzimately a 3 to 1
- True or False: Electrons flow from negative to postive.
- term for iron magnets and other easily demagnetized magnets
- term for the amount of charge that, in each second, passes a given point on the conductor
- 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
- term for a material that is strongly attracted to a magnet because it has two or more unpaired electrons per atom
- Magnetizing an object by bringing it into the presence of an existing magnet is called magnetization by _____.
- term for the field strength at a particular point in a magnetic field
- Danish physicist who found that an electric current affects the magnetic meedle of a compass
- two ways to magnetize an object
- term for the total number of lines falling on any surface, or the total magnetic influence playing oupon a surface
- term for when an electron seems to spin but does not actually spin
- term for isolated north poles and south poles that might occur somewhere in nature
- The lines of flux are more concentrated where the magnetic field is ____.
- term for a solenoid with a core of iron, permalloy, or similar material
- term for highly permeable materials that resist penetration by lines of flux
- term for the spin axes of all the unpaired electrons pointing in the same direction
- another term for magnetic induction
- term for a material that has only one unpaired elctron per atom, and is weakly attracted to a magnet
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
- the law that states that unlike poles attract whereas like poles repel
- term for magnetic moment produced by electrons
- term for a magnetic form of iron ore
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
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
- term for a material that is repelled by a magnet
- term for an electron that rotates on its own axis
- term that describes electricity through a circuit as positive charges flowing from positive to negative
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
extent to which a material absorbs lines of flux is related to its
_____, or how strongly it is magnetized by a magnetic field.
- the rule that says that negative current flows the oposite direction of positive current
- term used for any piece of magnetized rock since it had value in giving direction
- term for the end of a lodestone that gains a north-ward direction
- term for a small region containing billions or trillions of atoms with aligned magnetic poles
- term for the end of a lodestone that gains a southward direction
- Lines of flux must be drawn as ___ ___.
- Magnetizing an object by stroking or touching it with an existing magnet is called magnetization by ____.
- The direction of field strength acting on an isolated north pole is _____ to a line of flux at every point.
- the value of the permeability constant for a vacuum
- A magnetic pole is always paired with its opposite; thus, every magnet is ____.
- term for lines on diagrams or drawings that show which ways the north and south poles point
- term for an alloy of aluminum, nickel, cobalt, and iron in various proportions, of which many permanent magnets are made