The region of concentrated magnetism at the end of a magnet
pole
the rate electric charge flow
current
a ballon is rubbed with a wool cloth and sticks to the wall. Why can the balloon stick to the wall?
Electric charge builds up
moves when a charge flows through an electorlyte
ions
The force between two charged objects is 5.0 N. What is the force if one of the objects is replced by an object with half the charge?
2.5 N
happens to resistance as the diameter of a conductor increases
resistance decreases
happens if an objects domains are pointing in opposite directions
the domains cancel each other
the orientation of the lines of flux when the indication at the magnetic poles is +-90
vertical
process that imparts electric charge at a distance without direct contact between objects
induction
the SI base unit of current
ampere
the resistance of a magnet to being demagnetized by a magnetic field
coercivity
the term describes an object with an equal number of positive and negative charges
neutral
the work per unit charge done to move electric charges between different parts of an electric field
voltage
an object capable of attracting materials by magnetic force
magnet
a device that transforms the energy of an electric current into another useful form of energy
load
the SI unit of resistance
Ohm
the two belts of charged particles located above earth's equator
Van Allen radiation belts
material through which current does not easily flow
insulator
material that allows current to flow through it with no resistance
superconductor
electrical device designed to hinder current flow
resistor
material through which current flows easily
conductor
the earth's "north seeking" pole
south magnetic pole
a simple device that uses the laws of electrostatics to detect small electric charges
electroscope
an electric field that has equal strength throughout
uniform
force that causes an electric charge moving through a magnetic field to deviate from its original path
deflecting force
a device that opens or closes a circuits
switch
used to indicate the direction and strength of a magnetic field
lines of flux
happens to the total current flowing in a parallel circuit in an electric current
Increases
describes a substance that has several unpaired electrons per atom and is strongly attached to magnets
ferromagnetic
imaginary line that circles earth halfway between the two magnetic poles
magnetic equator
an electromagnet's coil had 50 loops. what will happen to the strength of the electromagnet if another 50 loops are added?
doubles
a device that uses a narrow strip of metal to prevent excessive current through a circuit
fuse
the most important factor affecting the ease of current flow through a wire
material
method of magnetism used when a needle is magnetized by holding a magnet near the needle
magnetizing by induction
how two like charges interact when they are brought close to each other
repel
a circuit that contains a complete path of electrons to flow through
closed circuit
The extent to whi h a material can absorb or channel lines of flux
Permeability
The process of diverting unwanted electric charge directly into the earth
Grounding
The extent of a planet's magnetic field in space
Magnetosphere
The law that relates current, voltage and resistance
Ohm's law
The line connecting all points where a compass needle points true north
Agonic line
A substance that has no unpaired ele trans and is slightly repelled by either pole of a magnet
Diamagnetic substance