Physics Ch 5. Electrostatics and Magnetism

Question 1

Coulomb

Answer 1

The SI unit of charge

Question 2

Protons

Answer 2

Have a positive charge equal to the fundamental unit of charge, E equals 1.6×10^-19th C

Question 3

Electrons

Answer 3

A negative charge equal to the fundamental unit of charge, E equals 1.6×10^-19th C

Question 4

Attractive forces

Answer 4

Occurs between opposite charges

Question 5

Repulsive forces

Answer 5

Occurs between like charges

Question 6

Conductors

Answer 6

Allow the free and uniform passage of electrons when charged

Question 7

Insulators

Answer 7

Resist the movement of charge and will have localized areas of charge that do not distribute over the surface of the material

Question 8

Coulombs law

Answer 8

Gives the magnitude of the electrostatic force factor between the two charges, the force vector always points along the line connecting the centers of the two charges

Question 9

Electric field

Answer 9

Is generated by every charge, can exert forces on other charges, is the ratio of the force that is exerted on a test charge to the magnitude of that charge

Question 10

Field lines

Answer 10

Radiate outward from the positive source charges and radiate in word to negative source charges, represent electric field vectors, positive charges will move in the direction of field lines, negative charges will move in the opposite direction of the field lines

Question 11

Electric potential energy

Answer 11

The amount of work required to bring a test charge from infinitely far away to a given position in the vicinity of a source charge

Question 12

Electric potential energy of a system

Answer 12

Will increase when to like charges move toward each other or one to opposite charges move further apart, will decrease when to opposite charges move toward each other or one to like charges move further apart

Question 13

Electric potential

Answer 13

The electric potential energy per unit charge, different points in the space of an electric field surrounding a source charge will have different values

Question 14

Voltage

Answer 14

aka potential difference, is the change in electric potential that accompanies the movement of a test charge from one position to another, is path independent and depends only on the initial and final position of the test charge, units are volts

Question 15

Potential difference

Answer 15

aka voltage, is the change in electric potential that accompanies the movement of a test charge from one position to another, is path independent and depends only on the initial and final position of the test charge, units are volts

Question 16

Test charges movement

Answer 16

Will spontaneously move in whichever direction results in a decrease in the electric potential energy, positive test charges will move from high potential to low potential and negative test charges will spontaneously move from low potential to high potential

Question 17

Equipotential lines

Answer 17

Designate the set of points around a source charge or multiple source charges that have the same electric potential, always perpendicular to electric field lines, work will be done when a charge is moved from one equipotential line to another but the work is independent of the pathway taken between the lines, no work is done when a charge moves from point to point on the same equipotential line

Question 18

Electric dipole

Answer 18

Generated by two charges or opposite signs separated by a fixed distance, d, will experience a net torque in an external electric field until it is aligned with the electric field vector, electric field will not induce any translational motion in the dipole regardless of its orientation with respect to the electric field vector

Question 19

Magnetic fields

Answer 19

Created by magnets and moving charges, external magnetic fields exert forces on charges moving in any direction except parallel or antiparallel to the field

Question 20

Tesla

Answer 20

The SI unit for the magnetic field

Question 21

Diamagnetic materials

Answer 21

Possess no unpaired electrons and are slightly repelled by a magnet

Question 22

Paramagnetic materials

Answer 22

Possess some unpaired electrons and becomes weekly magnetic in an external magnetic field

Question 23

Ferromagnetic materials

Answer 23

Possess some unpaired electrons and become strongly magnetic in an external magnetic field

Question 24

Magnets

Answer 24

Have both a north and South Pole, field lines point from the north to the south pole

Question 25

Current carrying wires

Answer 25

Create magnetic fields that are concentric circles surrounding the wire

Question 26

Point charges magnetic field

Answer 26

May undergo uniform circular motion in a uniform magnetic field wherein the centripetal force is the magnetic force acting on the point charge

Question 27

Magnetic force

Answer 27

The direction of the magnetic force on a moving charge or current-carrying wire is determined using the right-hand rule

Question 28

Lorentz force

Answer 28

Sum of the electrostatic and magnetic forces acting on a body

Question 29

Coulombs law equation

Answer 29

Fe = kq1q2/r^2

Question 30

Electric field equation

Answer 30

E = Fe/q = kQ/r^2

Question 31

Electric potential energy

Answer 31

U = kQq/r

Question 32

Electric potential (from electric potential energy) equation

Answer 32

V = U/q

Question 33

Electric potential (from voltage source) equation

Answer 33

V = kQ/r

Question 34

Voltage equation

Answer 34

DELTAV = Vb-Va = Wab/q

Question 35

Electric potential near a dipole equation

Answer 35

V = kqd/r^2*cos(theta)

Question 36

Dipole moment equation

Answer 36

p = qd

Question 37

Electric field on the perpendicular bisector of a dipole equation

Answer 37

E = 1/4/pi/epsilon x p/r^3

Question 38

Torque on a dispole in an electric field equation

Answer 38

tau = pEsin(theta)

Question 39

Magnetic field from a straight wire equation

Answer 39

B = mu*I/2/pi/r

Question 40

Magnetic field from a loop of wire equation

Answer 40

B = mu*I/2/r

Question 41

Magnetic force on a moving point charge equation

Answer 41

Fb = qvbsin(theta)

Question 42

Magnetic force on a current-carrying wire

Answer 42

Fb = ILBsin(theta)