PHYS Ch. 5 Electromagnetics & Magnetism Flashcards
What is Coulomb’s charge?
e = 1.60 x 10^-19 C
What is the equation for Coulomb’s law?
Fe = kq1q2/r^2
k = 8.99 x 1-^9 N*m^2/C^2
q1 and q2 are the magnitudes of the two charges, r is the distance between the two charges
What happens to force if the distance b/w 2 charges are doubled?
force is reduced by 1/4
What is the gravitational force acting on a charged particle?
6.67 x 10^-11 N*m^2/kg^2
What is the equation for the law of universal gravitational state?
Fe/Fg = kq1q2/Gm1m2
k = 8.99 x 1-^9 Nm^2/C^2
G = 6.67 x 10^-11 Nm^2/kg^2
q1 and q2 are the magnitudes of the two charges, m is the masses of two charges
What is the equation for the electrical field magnitude?
E = Fe/q = kQ/r^2
E in Newtons per Coulomb, Fe = magnitude of force, q = charge, k = electrostatic constant, Q = the source charge magnitude, r = distance b/w chagres
What are field lines?
illustrations of the electric field vectors for a charge. they point away from the positive charge and towards the negative charge
What does the density of the field line state about the electrical field?
the denser the field lines the stronger the elctrical fiedl
What does the test charge of the field line state about the electrical field?
if the test charge within the field is positive, then the force will be in the same direction as the electrical field of the source charge and vice versa
What is the equation of electric potential energy?
U = KQq/r
When will the electrical potential energy of a system increase or decrease?
the electrical potential energy will increase when two like charges move towards each other or when two opposite charges move apart, and vice versa
What is the equation of electric potential?
V = kQ/r
V = 1 V = 1 J/C
What is current?
the move of positive charges from positive to negative
What is the SI unit of the magnetic field?
tesla (T) = 1 Ns/mC
What is diamagnetic?
material made of atoms with no unpaired electrons and that have no net magnetic field
What is ferroamagnetic?
material that has an unpaired electron and permanent atomic magnetic dipole that are normally orientated readily so that the material has no net magnetic dipole
What is the equation for calculating the magnitude of a long, straight wire?
B = UoI/2pir
r = distance from the wire, Uo = 4pi x 10^-7 T*m/A,
I = current, pi = 3.14
What is the equation for calculating the magnitude of circular wire?
B = UoI/2r
r = distance from the wire, Uo = 4pi x 10^-7 T*m/A,
I = current
What is the equation of force on a moving charge?
FB= qvB*sin(0)
q = charge, v = velocity, B = magnitude of magnetic field, 0 = the smallest angle b/w the v and B
What force is exerted on a charge moving parallel and antiparallel to the direction of the magnetic field?
any charge moving parallel or antiparallel to the direction of the magnetic field will experience no force from the magnetic field
What is sine 0 and 180 degrees?
zero
What is the equation of force on a current-carrying wire?
FB = ILB*sin(0)
I = current, L = length of the wire in the field
B = magnitude of magnetic field
0 = angle between L and B
What is the diff b/w a conductor and an insulator?
conductors allow the free and uniform passage of electrons when charges, while insulators resist the movement of charge and will localized areas of charge that do not distribute over the surface of the material
What does Coulomb’s law give?
it gives the magnitude of the electrostatic force vector b/w two charges
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