Electricity Flashcards
SI unit for measuring magnitude of an electric charge
Coulomb (C)
Charge on an electron
1.6 * 10^-19 C
Electrically charged particles exert a ______ on each other.
Force
Unlike charges ______ while like charges ______.
unlike attract
like repel
Equation: Coulomb’s Law
F(e) = k * q1 * q2 / r^2
SI Unit = Newton
electric force that charged objects (point charges) exert on each other
depends on the amount of charge on and the distance between the objects
the greater the charges and the closer they are, the greater the force
electrostatic force
magnitude of Electrostatic Force exerted by one point charge on another is ________ proportional to magnitude of charge and ________ proportional to square of the distance between the charges
directly prop. to magnitude
inversely prop to distance between the two charges
Proportionality constant, Coulomb’s law
k = 8.99 * 10^9 N*m^2 / C^2
Equation: Electric Field
E = F / q
Note: E = electric field; F = electrostatic force; q = small test charge placed at that point
SI Unit = Newton / Coulomb (N/C)
field that exists at a point is the electrostatic force (F) experienced by a small test charge (q) placed at that point divided by the charge itself
vector quantity
electric field (E) SI Unit = N/C
Direction of electric field and direction of the Force on a negative test charge will be in _______ directions
opposite
direction of electric field is the same as the direction of the force F on a _______ test charge
positive
Equation: Electric field produced by a point charge q
E = k * q / r^2
SI Unit = N/C
electric field lines at a given location point in the direction that a ________ test charge would move when placed there
positive test charge
i.e. from a positive toward a negative charge
Lines always directed away from the positive charges and toward negative charges
indicate direction and magnitude of an electric field
positive charges = source of lines
negative charges = sinks of lines
electric field lines
