Mcat Physics Chapter 7 Magnetism

Front 1

in

Back 1

in which direction is the magnetic field

Front 2

electrostatics says that there are electric charges but in magnetism, there is no?

Back 2

fundamental magnetic charge

Front 3

magnetic fields are created by?

Back 3

moving electric ch, currents in wires, and permanent magnets

Front 4

magnetic fields exert forces on?

Back 4

moving charges, currents in wires, and permanent magnets

Front 5

B is a?

Back 5

fixed and uniform magnetic field

Front 6

si unit of magnetic field is?

Back 6

Tesla

Front 7

Testla=?

Back 7

N(s)/m(C)

Front 8

small magnetic fields are measured in?

Back 8

gauss

Front 9

1 tesla= __________ Gauss

Back 9

10^4 gauss

Front 10

a charge moves in a magnetic field
F from the magnetic field=?

Back 10

F=qvBsinθ

Front 11

F=qvBsinθ
what is B

Back 11

the strength of the magnetic field

Front 12

when a charge moves parallel or antiparallel to a magnetic field the magnetic force is?

Back 12

zero

Front 13

if a charge moves at θ=0 or 180 to a mag field what happens?

Back 13

mag force is zero

Front 14

F = qvB sinθ
what is θ?

Back 14

θ is the smallest angle betw the vectors qv and B

Front 15

F = qvB sinθ

what is q?

Back 15

q is the charge of the moving particle

Front 16

for determining direction of mag force
if q is nonzero and positive ch, then the vector qv _________ as v

Back 16

points in the same direction

Front 17

mag force
if q is nonzero and neg ch, then the vector qv _________ as v

Back 17

points in opposite direction

Front 18

ch in a magn field
if q or v is zero then the magnetic force?

Back 18

is zero

Front 19

the direct of the magn force will be ________ to the plane defined by qv and B

Back 19

perpendicular

Front 20

right handed rule for magn
the ________ of the right hand points in direction of the vector qv (if q is positive)

Back 20

thumb

Front 21

right h rule
the thumb of the right hand points in ?

Back 21

direction of qv (if q is positive)

Front 22

right handed rule
the thumb of rh points in dir of qv, and the fingers point in direct of?

Back 22

of B

Front 23

ch in magn field

right th points in dir of qv, fingers point in dir of B,
and _________ shows you direct of F

Back 23

which way the palm faces

Front 24

right handed rule for magn
thumb is?
fingers are?
palm is?

Back 24

thumb is qv
fingers are B
palm is F- magn force on q

Front 25

magn field
symbol x means?

Back 25

a field going into the page.
x represents the tail end of an arrow going into the page

Front 26

magn field
symbol  represents?

Back 26

a field coming out of the page
it represents the tip of an arrow coming out of the page

Front 27

Suppose a proton, whose charge is +1 .6 x 10-19 C, is moving with a speed of 15 m/s in a direction parallel to a uniform magnetic field of 3.0 T. What is the magnitude and direction
of the magnetic force on the proton?

Back 27

since qv and B are parallel
the angle is 0 and the sin of 0 is 0 so
force is zero
F = qvB sin 0

Front 28

Suppose a proton whose charge equals +1 .6 x 10-19 C is
moving with a speed of 15 m/s toward the top of the page
and through a uniform magnetic field of 3.0 T directed into
the page. What is the
direction of the magnetic force on the proton?

Back 28

the direction of the F is to the left

Front 29

Remember the direction of the magnetic force on a negative charge is?

Back 29

opposite the direction of the force on a positive charge moving in the same direct as the negat one

Front 30

when a ch particle moves perpend to a const uniform magn field the resulting motion is?

Back 30

circular motion w a const speed in a plane perpend to mag field

Front 31

charg part mov perp to magn field
the centripetal force is the?

Back 31

magnetic force
F=qvBsin90 (sin90 is 1)

Front 32

charg part mov perp to magn field
F=qvB= ?

Back 32

F=qvB=mv^2/r

Front 33

ch part in a magn field

F=qvB=mv^2/r
you can use this to solve for what?

Back 33

orbit radius, mang field, etc

r=mv/qB B=mv/qr

Front 34

Suppose the proton of the previous example is allowed to
circle (counterclockwise) in the same perpendicular magnet-
ic field of 3.0 T with the same speed of 15 m/s. What is the orbit radius r? (The mass of a proton is
1.67 x 10-27 kg.)

what equation will you use?

Back 34

r=mv/qB

Front 35

for a given field direction, if positive charges circle clockwise, then negative charges circle?

Back 35

counterclockwise

Front 36

electric current
when 2 points at different __________are connected w a conductor, charge flows betw the 2 points

Back 36

electric potentials

Front 37

magnitude of current is?

Back 37

the amount of charge i=Δq/Δt

Front 38

current is in the directions that?

Back 38

positive ch would flow

Front 39

t or f
current is in the direct that posit ch would flow

Back 39

t

Front 40

si unit of current is?

Back 40

ampere

Front 41

ampere is the si unit of?

Back 41

current

Front 42

1A= ?

Back 42

1 coulomb/second

Front 43

1 c/s=

Back 43

1 A

Front 44

since electrons are negativ cha they go from _________ potent to ___________ potent

Back 44

low to high potential

Front 45

by convent direc of current is direct posit ch would flow which is from ________ potent to __________ potent

Back 45

high to low

Front 46

force on current carrying wire due to magn field
F=?

Back 46

F=iLBsinθ

Front 47

force on current carrying wire due to magn field

iLBsinθ is equal to what?

Back 47

the F due to the magnetic field

Front 48

right hand rule for force on a current carrying wire in a magn field

thumb of rh points in?

Back 48

DIRECTION of current i

Front 49

right hand rule for force on a current carrying wire in a magn field

fingers of rh point in?

Back 49

direction of B

Front 50

right hand rule for force on a current carrying wire in a magn field

right hand rule
thumb?
fingers?
palm?

Back 50

thumb- direct of i
fingers- direct of B
palm- F - the magn force on current carrying wire

Front 51

Suppose a wire of length 2.0 m is conducting a current of 5.0 A toward the top of the page and through a 30 Gauss uni-
form magnetic field directed into the page. What is the direction of the magnet-
ic force on the wire?

Back 51

force on wire is to the left

Front 52

Suppose a wire of length 2.0 m is conducting a current of 5.0
A toward the top of the page and through a 30 Gauss uni-
form magnetic field directed into the page (see figure
7.3(a)). What is the magnitude and direction of the magnet-
ic force on the wire?

what do you need to watch out for?

Back 52

to convert gauss into tesla

1 T= 10^4 Gauss

Front 53

10^4 Gauss= __________ Tesla

Back 53

10^4 Gauss= 1 Tesla

Front 54

if a wire has no current moves thr a magnetic field what happens?

Back 54

nothing. wires w no curr are electric neutral. no magn force is generated

Front 55

Suppose a wire of length 2.0 m is conducting a current of 5.0
A toward the top of the page and through a 30 Gauss uni-
form magnetic field directed into the page. What is the magnitude and direction of the magnet-
ic force on the wire?

set up equation

Back 55

F = iLB sinθ = iLB

=5.0(2.0)(3.0)X 10-3)

Front 56

any moving charge creates a?

Back 56

magnetic field

Front 57

differ ways to gener a magn field?

Back 57

1. flow of ch in perman magn
2. electric curr
3. indiv moving ch

Front 58

it is the _____________ that gives rise to the magnetic field

Back 58

movement of ch

Front 59

magnetic field lines

magnetic field is ____ to the magn field line at any point

Back 59

tangent

Front 60

_____________ can be used to visualize the magnetic field

Back 60

magnetic field lines

Front 61

magn materials are classified as?

Back 61

1. diamagnetic
2. paramagnetic
3. ferromagnetic

Front 62

diamagnetic material are?

Back 62

indiv atoms have no net magn field. will be repelled from pole of a strong bar magn. called weakly antimagnetic

Front 63

which magnetic material is weakly antimagnetic?

Back 63

diamagnetic

Front 64

in a ______________ the individ atoms have no net magn field

Back 64

diamagnetic material

Front 65

paramag material is _____________ magnetic

Back 65

weakly

Front 66

in paramag and ferromagnetic mat the indiv atoms do have a ?

Back 66

net magn field but they are randomly oriented so net magn field.

Front 67

ferromagnetic materials below the critical temperature called _______ can dev a higly aligned magn field

Back 67

Curie temperature

Front 68

above the Curie temp the ferromagnetic material is ?

Back 68

paramagnetic

Front 69

_________ are called strongly magnetic

Back 69

ferromagn

Front 70

t or f
iron, nickel, and cobalt are ferromagnetic

Back 70

t

Front 71

when the north pole of a compass magnet points along local field lines of earths mag field it is pointing?

Back 71

towards a magnetic south pole

Front 72

on earth, what we call the northern direction is really?

Back 72

the direction of a magn south pole

Front 73

what is the name of the critical temp below which a paramagn mater bec ferromagn?

Back 73

curie temperat

Front 74

north pole is place where magnetic field lines?

Back 74

emerge

Front 75

south pole is where magn field lines?

Back 75

enter

Front 76

the _________ pole is where magnetic field lines emerge

Back 76

north

Front 77

the _______________ pole is where magnetic field lines enter

Back 77

south

Front 78

t or f
a current carrying wire will prod a magnetic field in its vicinity

Back 78

t

Front 79

the mag f of a curr carrying wire is the _______ of the magn f due to indiv moving ch of the curr

Back 79

vector sum

Front 80

an infinitely long str wire w curr

B=

Back 80

B= µoi/2πr

Front 81

µo is

Back 81

the permeability of free space
= 4π X 10-⁷ Tesla∙meter/ampere

Front 82

what are the units of µo?

Back 82

Tesla∙meter/ampere

Front 83

µo=

Back 83

=4π X 10-⁷ Tesla∙meter/ampere
=1.26 X 10-6 T∙m/A

Front 84

for a long str wire the magn field strenght __________ with distance

Back 84

drops off

Front 85

magnetic field lines __________ currents

Back 85

encircle

Front 86

current carrying wire
right hand rule
right thumb is?
fingers?

Back 86

right thumb is in direct of current
fingers curl in direction of generated mag field B

Front 87

A straight wire carries a current of 5 A toward the top of the
page. What is the direc-
tion of the magnetic field at point P, which is 10 cm to the
left of the wire?

Back 87

B is coming out of the page.

Front 88

magn field at the center of a circular loop of curr carrying wire of radius r is?

Back 88

B=µoi/2r

Front 89

B=µoi/2r
only gives the magnetic field at?

Back 89

one point in space, the point at the center of the loop

Front 90

Suppose a wire is formed into a loop that carries current
clockwise (that is, electrons flow counterclockwise) Find the direction of the magnetic field pro-
duced by this loop:
a. within the loop.
b. outside of the loop.

Back 90

a. into the page
b. outside the loop. B will point out of the page.

Front 91

out of the page

Back 91

A negative charge placed in an external magnetic field circulates
counterclockwise in the plane of the paper as shown below. In which
direction is the magnetic field pointing?

Front 92

downward, dont forget its an electron so its opposite.

Back 92

If, as in the accompanying figure, an electron is travelling straight
out of the page crossing a magnetic field that is directed from left to
right, in which direction will the electron be deflected?

Front 93

yes, F=iLB so the wider the pole face, the more wire that is in the magnetic field and the force can be stronger

Back 93

A long straight wire carrying current I is placed between the poles of
a horseshoe magnet as shown in the figure below. Does the force on
the wire depend on the width of the pole faces, and if so then why?
Assume that the strength of the field is independent of the width of
the pole faces.

Front 94

A positively charged particle enters a region with a uniform electric
field, as shown, and is initially moving perpendicular to the field. In
what direction must a uniform magnetic field be oriented so that the
net force on the particle is zero (assuming that the strength of the
magnetic field can be appropriately adjusted)?

Back 94

heading out of the page, it will creat a magnetic force F=qvBsin angle downwards, electric field is creating a force pushing the charge up