Coulomb's Law
Coulomb's Law electrical force between 2 objects is proportional to the magnitude of their charges & inversely proportional to the square of the distance between them
-k is Coulomb's constant
-q1 and q2 are the charges (measured in Coulombs; 1 Coulomb (C) = 6.3 x 1018 electrons)
-charge of a proton = e = 1.6 x 10-19 C; charge of an electron = -1.6 x 10-19 C
-r is the distance between charges along the same line *Coulomb's Law applies only to point charges or particles & to spherical distributions of charges -Fe is attractive if charges are of opposite sign
-Fe is repulsive if charges are of same sign
-Fe obeys Newton's 2nd & 3rd Laws of Motion
-Fe is a vector Definition: Conductor -a material in which electric charges move freely
-i.e., copper, iron Definition: Insulator -a material in which electric charges do not move freely
-i.e. plastic, rubber Definition: Semiconductors -materials having electrical properties between those of conductors and insulators
-i.e. silicon, germanium Definition: grounded -when a conductor is connected to the Earth by a conducting wire Definition: induction (inducing a charge) -charging an object without coming into contact with it Definition: conduction (conducting a charge) -charging an object through contact Definition: field force -one exerted by object on another though no physical contact is made
An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit
Coulomb force is a law of physics describing the electrostatic interaction between electrically charged particles
Charging by Conduction and Induction
Static electricity can be detected by a gold leaf electroscope. One can make a model of an electroscope at home also (see box). An electroscope will be able to detect the presence of static charges, but is unable to give you any information about the sign (negative or positive) of the charges. Only a reasonable guess
-k is Coulomb's constant
-q1 and q2 are the charges (measured in Coulombs; 1 Coulomb (C) = 6.3 x 1018 electrons)
-charge of a proton = e = 1.6 x 10-19 C; charge of an electron = -1.6 x 10-19 C
-r is the distance between charges along the same line *Coulomb's Law applies only to point charges or particles & to spherical distributions of charges -Fe is attractive if charges are of opposite sign
-Fe is repulsive if charges are of same sign
-Fe obeys Newton's 2nd & 3rd Laws of Motion
-Fe is a vector Definition: Conductor -a material in which electric charges move freely
-i.e., copper, iron Definition: Insulator -a material in which electric charges do not move freely
-i.e. plastic, rubber Definition: Semiconductors -materials having electrical properties between those of conductors and insulators
-i.e. silicon, germanium Definition: grounded -when a conductor is connected to the Earth by a conducting wire Definition: induction (inducing a charge) -charging an object without coming into contact with it Definition: conduction (conducting a charge) -charging an object through contact Definition: field force -one exerted by object on another though no physical contact is made
An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit
Coulomb force is a law of physics describing the electrostatic interaction between electrically charged particles
Charging by Conduction and Induction
Static electricity can be detected by a gold leaf electroscope. One can make a model of an electroscope at home also (see box). An electroscope will be able to detect the presence of static charges, but is unable to give you any information about the sign (negative or positive) of the charges. Only a reasonable guess