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Physics 201: General Physics II > Exam 1 > Flashcards

Exam 1 Flashcards

(112 cards)

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1
Q

q=Ne
q=

A

charge

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2
Q

q=Ne
N=

A

number of electrons

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3
Q

q=Ne
e=

A

charge on a single electron

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4
Q

charge is a _____ force

A

conservative

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5
Q

if an object is polarized, it means…

A

charges shift in a neutral object

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6
Q

conductors vs insulators

A

conductors:
metals
allow e- to transfer

insulators:
plastic
hold e- more tightly

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7
Q

µ =

A

10^-6

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8
Q

F=k (q1q2/r^2)
F=

A

force

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9
Q

F=k (q1q2/r^2)
k=

A

Coulomb’s constant
9x10^9

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10
Q

F=k (q1q2/r^2)
q=

A

charge on that specific object

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11
Q

F=k (q1q2/r^2)
r=

A

the distance between q1 and q2

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12
Q

given q=18µC and d=15cm, find magnitude and direction on force 1.
q1 = +q
q2 = -2.0q
q3 = +3.0q

A
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13
Q

-3.00µC in the center of a compass. 2 additional charges are on the center (r=.100m). -4.0µC due north and +5.0µC due east.
find the direction and magnitude of the charge in the center.

A
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14
Q

an electron moves at 8.5x10^5m/s. what is the radius?

A
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15
Q

+q placed in an electric field will accelerate _____ the field (gravity)

A

with

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16
Q

-q placed in an electric field will accelerate _____ the field (gravity)

A

against

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17
Q

density of electric field lines relates to the ______ of E

A

magnitude

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18
Q

2 point charges are placed on an x-axis. -5.5µC at the origin and 8.5µC ar x=10cm.
what is the net electric field at x=-4cm?

A
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19
Q

2 point charges are placed on an x-axis. -5.5µC at the origin and 8.5µC ar x=10cm.
what is the net electric field at x=4cm?

A
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20
Q

2 point charges are placed on an x-axis. -5.5µC at the origin and 8.5µC ar x=10cm.
where is the net field =0?

A

E+ = E-
0.41m left

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21
Q

an electron enters a capacitor with v=5.75x10^6m/s. it has a downward distance of d=0.638 and a horizontal length of 2.25cm.
what is the magnitude of the electric field?

A
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22
Q

an electron is placed between plates of a parallel plate capacitor. when released, it remains balanced.
what is the magnitude and direction of the electric field

A

F=ma
FE-Fg = 0
FE=Fg
qE=mg
E=mg/q
E= 5.58x10^-11 N/C downward

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23
Q

an electron is placed between plates of a parallel plate capacitor. when released, it remains balanced.
if gravity is turned off, what is the acceleration if a proton is released?

A

F=ma
0-FE=ma
-qE=ma
a=-qE/m
a=5.34x10^-3 m/s^2 downward

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24
Q

ideal conductors have
_____ charge
fields _____ and at _____
and _____ shielding

A

excess
inside and at surface
electron shielding

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25
point charge:
E=kd/r^2
26
voltage = ________
electrical potential
27
do you use signs in k(q1q2/r^2)
NO!
28
moving against gravity = ______ height
gaining
29
moving against electric field = ______ voltage
gain
30
moving with the electric field = ______ voltage
lose
31
W = -q∆V W=
work
32
W = -q∆V q=
charge
33
W = -q∆V V=
change in potential/voltage
34
E=- ∆V/∆d E=
electric field
35
E=- ∆V/∆d V=
potential difference
36
E=- ∆V/∆d d=
distance between plates
37
____ decreases when you move with gravity
height
38
______ decreases when you move with the electric field
potential/voltage
39
a ______ mass accelerates against the gravitational field from a high to low gravitational height
positive
40
a positive mass accelerates _____ the gravitational field form a high to low gravitational height
against
41
a ______ charge accelerates with the electric field from a high to low electrical height
positive
42
a positive charge accelerates _____ the electric field from a high to low electrical height
with
43
a positive charge is moving with the field q∆V = -We = ∆EPE
q∆V = -We = ∆EPE + - - (+) -
44
a negative charge is moving with the field q∆V = -We = ∆EPE
q∆V = -We = ∆EPE - - - (-) +
45
a positive charge is moving against the field q∆V = -We = ∆EPE
q∆V = -We = ∆EPE + + - +
46
a uniform electric field points in the negative y and magnitude of 4300N/C what is the electrical potential difference between Vb-Va?
0V
47
a uniform electric field points in the negative y and magnitude of 4300N/C what is the electrical potential difference between Vc-Vb?
∆V=E∆d 344V
48
a uniform electric field points in the negative y and magnitude of 4300N/C what is the electrical potential difference between Va-Vc?
∆V=E∆d -344V
49
energy conservation:
1/2mva^2 + qVa = 1/2mvb^2 + qVa
50
electrons in a tv set accelerate from rest at point A at a potential difference of 25kV to point B _____ has the higher potential energy
B
51
electrons in a tv set accelerate from rest at point A at a potential difference of 25kV to point B the electric field points from _____
B -> A
52
electrons in a tv set accelerate from rest at point A at a potential difference of 25kV to point B what is the speed of the electrons when they arrive at B?
53
finding the electrical potential for a point charge:
V=k (q/r)
54
equipotential surfaces are always _____ to electrical field lines
perpendicular
55
height _____ when moving away from the center
decreases
56
+4.0µC is placed at x=0 and -8µC 10cm to its right. what is the potential at the midpoint? what is the potential at 15cm?
57
a charge A of -3.0µC is fixed. from a horizontal distance of 0.0450m, a particle with mass 7.20x10^-3kg and a charge of -8.0µC is fired with an initial speed 165m/s towards a fixed charge (B). how far from charge is the particle when the speed is (a) 150m/s? (b) 0m/s?
58
x=0.25m and y=0.16m how much work is needed to assemble all 3 charges?
59
describe a capacitor
has "capacity" to store both electrical charge and energy (via) field
60
capacitors are dependent on _____ and _____
geometry composition
61
describe a dialectric
"stomps down" the electric field by polarization (trash back example)
62
Ohm's law: V=IR V=
voltage
63
Ohm's law: V=IR I=
current
64
Ohm's law: V=IR R=
resistance
65
low voltage = _____ resistance
low
66
2 ways to change resistance
geometry composition
67
R=p L/A R=
resistance of a wire
68
R=p L/A p=
resistivity
69
R=p L/A L=
length
70
R=p L/A A=
cross sectional area
71
more resistance = _____ resistance
less
72
increased area = _____ resistance
decreased
73
increased length = _____ resistance
increased
74
conductors _____ resistance
decrease
75
inductors _____ resistance
increase
76
an average tv set runs 6 hours a day. calculate the yearly cost of 100 million TVs when power consumptions is 165W and it costs 12.5c kW/hr
77
junction rule:
Iout = Iin
78
loop rule:
Vdrop = Vgain
79
big loop clockwise:
Vdrop = Vgain 5I2 + 18V + 10I3 = 13V
80
left loop counterclockwise:
Vdrop = Vgain 13V = 5I2 + 2V + 10I2
81
right loop counterclockwise:
Vdrop = Vgain 18V + 10I3 = 2V + 10I2
82
ammeters connect in _____ so there is _____ resistance
series zero
83
voltmeters connect in _____ so there is _____ resistance
parallel infinite
84
F=qe F=
force
85
F=qE E=
electric field intensity
86
F=qvB v=
velocity
87
F=qvB B=
magnetic field intensity
88
right hand rule: thumb is _____ fingers are _____ palm faces _____ and is ______
velocity field up, force
89
motion of charge in a B field?
F=ma qvB=m(v^2/r) r=mv/qB
90
a charged conductor is brought near an uncharged insulator. what happens to the objects?
they attract eachother
91
consider 3 identical spheres, A, B, and C. sphere A carries a charge of -2.0µC; sphere B carries a charge of -6.0µC; and sphere C carries a charge of +4.0µC. Sphere A and B touch and then separate. Sphere B and C touch and then separate. What is the charge on C?
0
92
a -4.0µC charge is located 0.4m to the left of a +6.0µC charge. what is the magnitude and direction of the electrostatic force on the positive charge?
93
an electron is located between the plates of a parallel plate capacitor. what is the magnitude and direction of the electronic field such that the electric force exactly balances the weight of the electron so it remains stationary?
qE=mg E=mg/q E=5.6x10^-11 N/C
94
the electron volt is a unit of _____
energy
95
as an electron moves against an electric field, its electric potential _____ and potential energy ______
increases decreases
96
2 point charges are held at the corners of a rectangle. h=0.050m and w=0.15m. what is the electric potential at point A?
97
what is the change in electric potential when a charge of -1.0µC is moved from A to F to C to E?
98
what way does the electric field point?
D
99
the potential difference across the ends of a wire doubles in magnitude. how does this effect the resistance?
no change can only be changed by geometry or composition
100
resistors in series have the same _____ through them
current
101
resistors in parallel have the same ______ through them
voltage
102
for resistors in parallel the total resistance is _____ any singular resistors
less than
103
for resistors in series, the total resistance is ______ any single resistor
greater than
104
what is the total resistance of the circuit?
105
what is the current through the 1.8Ω resistor? a) 3.3 b) 2.8 c) 14 d) 6.9 e) 5.6
V=IR Ibat = V/R 25/7.5 = 3.33A I1.8 must be < I bat so 2.8
106
the length of a wire is kept the same but the radius is doubled. this causes the resistance to ______ by a factor of ______
decrease 4
107
a 4A circuit is maintained in a simple circuit with a total resistance of 2Ω. how much energy is delivered in 45s?
V=IR V=(4)(2) = 8V P=IV P=(4)(8) = 32W P=energy/time energy=Pt (32)(45) = 1440J
108
if the current is 2A, what is the voltage?
V=IR (2)(3) = 6V
109
kirchoff's loop rule is a statement of the law of conservation of _____
energy
110
left loop clockwise Vdrop = Vgain
12I2 + 8I2 = 4V + 6V
111
right loop clockwise Vdrop = Vgain
4V + 2V = 6I3 + 8I2
112
whole loop clockwise Vdrop = Vgain
12I2 + 2V = 6I3 + 6V

Physics 201: General Physics II (7 decks)

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