PHYS Ch. 5 Electromagnetics & Magnetism

Question 1

What is Coulomb’s charge?

Answer 1

e = 1.60 x 10^-19 C

Question 2

What is the equation for Coulomb’s law?

Answer 2

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

Question 3

What happens to force if the distance b/w 2 charges are doubled?

Answer 3

force is reduced by 1/4

Question 4

What is the gravitational force acting on a charged particle?

Answer 4

6.67 x 10^-11 N*m^2/kg^2

Question 5

What is the equation for the law of universal gravitational state?

Answer 5

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

Question 6

What is the equation for the electrical field magnitude?

Answer 6

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

Question 7

What are field lines?

Answer 7

illustrations of the electric field vectors for a charge. they point away from the positive charge and towards the negative charge

Question 8

What does the density of the field line state about the electrical field?

Answer 8

the denser the field lines the stronger the elctrical fiedl

Question 9

What does the test charge of the field line state about the electrical field?

Answer 9

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

Question 10

What is the equation of electric potential energy?

Answer 10

U = KQq/r

Question 11

When will the electrical potential energy of a system increase or decrease?

Answer 11

the electrical potential energy will increase when two like charges move towards each other or when two opposite charges move apart, and vice versa

Question 12

What is the equation of electric potential?

Answer 12

V = kQ/r
V = 1 V = 1 J/C

Question 13

What is current?

Answer 13

the move of positive charges from positive to negative

Question 14

What is the SI unit of the magnetic field?

Answer 14

tesla (T) = 1 Ns/mC

Question 15

What is diamagnetic?

Answer 15

material made of atoms with no unpaired electrons and that have no net magnetic field

Question 16

What is ferroamagnetic?

Answer 16

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

Question 17

What is the equation for calculating the magnitude of a long, straight wire?

Answer 17

B = UoI/2pir
r = distance from the wire, Uo = 4pi x 10^-7 T*m/A,
I = current, pi = 3.14

Question 18

What is the equation for calculating the magnitude of circular wire?

Answer 18

B = UoI/2r
r = distance from the wire, Uo = 4pi x 10^-7 T*m/A,
I = current

Question 19

What is the equation of force on a moving charge?

Answer 19

FB= qvB*sin(0)
q = charge, v = velocity, B = magnitude of magnetic field, 0 = the smallest angle b/w the v and B

Question 20

What force is exerted on a charge moving parallel and antiparallel to the direction of the magnetic field?

Answer 20

any charge moving parallel or antiparallel to the direction of the magnetic field will experience no force from the magnetic field

Question 21

What is sine 0 and 180 degrees?

Answer 21

zero

Question 22

What is the equation of force on a current-carrying wire?

Answer 22

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

Question 23

What is the diff b/w a conductor and an insulator?

Answer 23

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

Question 24

What does Coulomb’s law give?

Answer 24

it gives the magnitude of the electrostatic force vector b/w two charges

Question 25

What