Physics Midterm part 3 Flashcards
Ferromagnetic
These are strongly magnetic and are highly permeable and greatly susceptible to magnetic induction. Examples are iron, nickel and cobalt.
Paramagnetic
Materials that will slightly increase magnetic field strength
EX: Good, aluminum, oxygen
Diamagnetic
These materials will slightly decrease magnetic field strength by repelling magnetic lines of force. Examples include beryllium, bismuth, copper, carbon and lead.
Non-magnetic
Have no attraction to a magnetic field and have no susceptibility.
Electrostatics
the branch of physics that deals with stationary or resting electrical charges.
Positive
Objects that emit electromagnetic lines of force or areas that have a deficiency of electrons
Negative
Objects that draw in electromagnetic lines of force or areas with an overabundance of electrons
Electrification
is the process of creating a positive or negative charge in a body of matter.
Friction
The rubbing together of two surfaces causes friction that can remove electrons from objects.
Contact method of electrification
When a charged object is allowed to touch an uncharged object, the latter will also become charged.
Induction method of electrification
Surrounding every charged object is an electrostatic field.
Ionization method of electrification
Ionizing radiation can remove electrons from atoms.
Law of attraction-repulsion
Like or same charges will repel while unlike or opposite charged will attract.
Field law
Around a charged object, there is an electrostatic field that is made up of lines of electromagnetic force.
Coulombs law
The electrostatic force between two charges is directly proportional to the strength of the charges and inversely proportional to the square of the distance between them.
F = k q1 q2/r2 or d2
Law of distribution
Electric charges reside only on the external surfaces of conductors.
Law of concentration
The concentration of charges on a curved surface is greatest wherever the curvature is greatest.
Law of movement
Only negative charges can move in a conductor.
Grounding
the process of neutralizing a charged body of matter.
Electroscope
A device that is used to detect the presence of an electrical charge. An electroscope can also determine if an unknown charge is positive or negative.
Charging an electroscope by Induction
Bring a charged rod near the metal knob but not touch it.
Charging an electroscope by Contact
Touching the metal knob with a charged rod will cause the metal leaves to separate
