Chapter 4 Flashcards
The mathematical formula F=kqQ/d2 that describes the strength of the force between two objects of charge Q and q separated between their centers by the distance d.
Electric Force Law
A number relating the strength of the electric force to the charges involved and their distance apart.
Electric force constant
The basic negative charge-carrying particle in an atom.
Electron
Used a gas discharge tube to determine that electricity had mass.
J. J. Thomson
Was not only renowned as a statesman, but he was also an accomplished scientist..
Benjamin Franklin
Discovered that forces between charged bodies are proportional to the charges on them, and inversely proportional to the square of their distance.
Augustin de Coulomb
Developed a way to measure the charge of individual electrons.
Robert Millikan
The unit of measure for charge: it is named after Charles Augustin de Coulomb, formulator of the Electric charge possessed by a single election or a proton is 1.6 x 10-19 coulombs.
Coulomb
A positively charged particle in atomic nuclei made up of three quarks.
Proton
An unchanged particle in atomic nuclei made up of three quarks.
Neutron
A material that does not permit electrons to flow through it.
Insulator
A material that allows electrons to flow through it.
Conductor
Electric charges flowing through a conductor.
Electric current
A steady flow of electrons in one direction, typically through a wire.
Direct current
A current of electrons that changes direction of flow.
Alternating current
Metal alloys that are attracted to magnets or are capable of being transformed into permanent magnets are called ferromagnetic.
Ferromagnetism
Physical quantity existing at every point in space. Some fields arise from sources and may be thought of as the “influence” of these sources.
Field
A small section in a magnet where the magnetic force from all the atoms add together.
Domain
The temperature above which a metal is no longer magnetized. The Curie temperature is unique for different types of metals.
Curie Temperature
Lines coming from an object representing the strength of the force. The denser the lines, the stronger the force.
Field lines
The force arising between objects when they touch. Contact forces are a repulsion caused by the electromagnetic interaction.
Contact Force
Friction comes from electromagnetic forces.
true
Electric force becomes stronger if the charged objects are moved farther apart.
false
Neutrons have a negative charge.
false
Iron and nickel are examples of ferromagnetic metals.
true
Electric currents exert forces on permanent magnets.
true
The basic positive charge-carrying particle in an atom.
proton
Metal alloys that are attracted to magnets or are capable of being transformed into a permanent magnet.
ferromagnetic
A materiel that does not permit electrons to flow through it.
insultator
The matematical formula F=kqQ/d2 which describes the strength of the force between two objects of charge Q and q with their centers separated by the distance d.
the Electric Force Law
A current of electrons that changes direction of flow.
alternating current
The unit of measure for charge.
Coulumb
Material that allows electrons to flow through it.
conductor
The basic negative charge-carrying particle in an atom.
electron
A steady flow of electrons in one direction through a wire.
direct current
A repulsive force between electrons near the surface of two different objects.
contact force
A number relating the strength of the electric force to the charges involved and their distance apart.
electric force constant
A neutral particle found in the nuclei of atoms.
neutron
When a glass rod is rubbed with rubber, it becomes positively charged. This is because
electrons are transferred from glass to rubber.
Who among the following did not contribute discoveries about electromagnetic interactions?
Henry Cavendish
Suppose you wanted to exactly double the electric force between two objects. How could you accomplish that?
Double the charge on one of the objects.
