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Physics 223 > First 5 weeks formulas > Flashcards

First 5 weeks formulas Flashcards

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1
Q

Electric field of line of charge) + what the r mean

A
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2
Q

nothing ur doing good keep up the work

A

:D

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3
Q

Electric field sphere of charge

A

same as point charge

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4
Q

e field in a capacitor

no E=v/s the one in formula sheet

A

2(a plane of charge)

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5
Q

acceleration in an uniform electrical field

A

a=qE/m

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6
Q

parabolic trajectories require… (2)

A

comstant acceleration

uniform e field

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7
Q

net force on dipole in uniform e field

A

0

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8
Q

torque on dipole in uniform electric field

A

τ = (q E sinθ) d = q d E sinθ

or Fdsintheta

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9
Q

electric field of dipole in the same y axis

what does r mean

A
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10
Q

electric field of dipole in the x axis (Bisecting)

+what does r mean?

A

the x axis

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11
Q

in positive work what is the direction of force and displacement

A

force is same direction as displacement

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12
Q

electric potential energy formula

A

U=qEs

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13
Q

potential of positive charge as it moves… (2)

A

always +

goes to zero

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14
Q

conservation of mechanical energy formula with kinetic and potential

A

1/2mv^2-qEx=1/2mv^2-qx

f=i

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15
Q

potential energy of two point charge

A
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16
Q

vf for a charge moving in uniform E field from rest

A

re arrange this 1/2mv^2-qEx=1/2mv^2-qx

f=I

vi=o. xi=o

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17
Q

escape speed is when

A

the speed that gives Em=0

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18
Q

work done on a DIPOLEEEEE

A
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19
Q

Parabolic trajectory only arise from

A

constant acceleration and uniform E field

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20
Q

net force on dipole in uniform field

A

no net force

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21
Q

for nonuniform electric field the net force on the dipole is towards what direction?

A

towards the direction of the strongest field

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22
Q

work and explain the relationship btwn the variables

force is constant

A

Find dot prduct when force is parallel to the displacement

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23
Q

Work by a non constant force formula+explain

A

we caculate work by dividing the path into many small segments of length (dx), finding the work done in each segment and then summing (integrating) from the start of path to end.

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24
Q

conservative force

A

work done on an object is independent of the path it took.

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25
Q

potential energy can only be defined when

A

the force is conservative

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26
Q

relate potential energy and work for me

work. initial.final/neg sign apply here rearrgange formula for me

A

change in potential energy is negative work (initial-final) which then becomes work final-initial

*ignore picture

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27
Q

electric potential energy in unifrom E field is equal to…

Hint u can figure this out from the work formula

A
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28
Q

in a uniform electric field and u project a particle to the plate with same charge, when does it change directions?

A

U elec= Emechanic

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29
Q

Potential energy of 2 point charge formula

*reminder this is the energy of the susytem not just q or Q

A

You can think of it as U=qEs

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30
Q

2 sphere of charge potential energy formula

A

same as point charge but r in this case means from the centre of each sphere

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31
Q

the potential energy of two charged particle is zero only when

A

they are infinitely far apart

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32
Q

When you do negative work your are____ the potential energy

A

increasing

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33
Q

multiple point charge electric potential energy

+formula

A

the sum of potential energy due to all pairs of charges

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34
Q

torque for a dipole

A

t=pXE

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35
Q

potential energy of dipole in unifrom E field

A
36
Q

formula for total work done on a dipole to turn it

A
37
Q

Formula for potential energy associated to work done on dipole

A
38
Q

potential difference between two points

A

voltage

39
Q

potential energy formula with volatge

A

U=qV

40
Q

electric potential at negative plate

A

0

41
Q

electric potential in capacitor

**Not potential energy

A

reaarange U=qES and U=qV

42
Q

equipotential

A

a region in space where every point is at the same potential

43
Q

electric potential of charge q (point charge) formula

A
44
Q

potential energy outside of a sphere formula charged to potential V0

(2) formulas

A

Vsphere=R/r (V0)

R=radius

45
Q

Ho do I find potential of a bunch of point charge?

A

adding the individual potential energies between each pair

46
Q

high potential is which side?

A

positive side

47
Q

for unifrom E field CHANGE IN V is (2)

+say one with area in it

A

-E(delta S)

48
Q

when is V =-Es?

When do we inetragrate V?

When do we use dot product for V?

Give me the two scenario

A

Neg when its “change in V”

49
Q

tell me abt sphere potential/E-field

A

The efield of a sphere inside the sphere is 0 because the potential inside and outside are the same and E=change in V/s and change in V is 0.

50
Q

any excess charges in a conductor in electrostatic equilibrium are

A

located on the surfae of the codusctor

51
Q

any two points inside the conductor in electrostatic equilibrium are

A

at the same potential

52
Q

Two conductors that come into contact form a

A

single conductor so they exchange charges needed to reach a common potential

53
Q

How do battery work?

A

The chemical reactions in the battery causes a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode. You can think of this difference as an unstable build-up of the electrons. The electrons wants to rearrange themselves to get rid of this difference. But they do this in a certain way. Electrons repel each other and try to go to a place with fewer electrons.

In a battery, the only place to go is to the cathode. But, the electrolyte keeps the electrons from going straight from the anode to the cathode within the battery. When the circuit is closed (a wire connects the cathode and the anode) the electrons will be able to get to the cathode. In the picture above, the electrons go through the wire, lighting the light bulb along the way. This is one way of describing how electrical potential causes electrons to flow through the circuit.

54
Q

EMF

+what is it not? +What is it?Apart. -talk abt neg charge and terminal

A

-Work done per charge to pull positive and negative charges apart.

-The force on the negative charge from the electric field is in the opposite direction of the electric field, as shown in Figure 6.1.2. In order for the negative charges to be moved to the negative terminal, work must be done on the negative charges.
IT IS is the amount of energy (E) provided by the battery to each coulomb of charge (Q) passing through.

-it is not a force but rather MAXIMIUM potential difference that creates an electric field that exerts force on charges, causing current. We thus use the name electromotive force

55
Q

Terminal voltage

A

the potential difference across the terminals of a load when the circuit is turned on

56
Q

Total potential difference for battery in series

A
57
Q

The Q and V in capcitor equations are awalys

A

positive

where Q is the magnitude of the charge on each capacitor plate, and V is the potential difference in going from the negative plate to the positive plate. This means that both Q and V are always positive, so the capacitance is always positive.

58
Q

The amount of charge on a capacitance is determined by

+What is capacitance determined by?

A

The potential difference, and property of the electrode called capacitance Q=CV

capacitance is determoned by geometry of electrodes

59
Q

Parallel plate capacitor charge formula

A

Combine: V=Ed and E=Q/e0A

60
Q

Capacitance of parallel plate capacitor:

A

COmbine charge formula with C=Q/deltaVc

61
Q

Relationship between current, lightbub and capacitor charging

A

electrons flow in the wires until the capacitors are charged. Once they are charged, no current will flow through and the light bulb would turn off.

62
Q

cuurent flow when charging a capacitor

picture

A
63
Q

capacitor charges until

A
64
Q

How are parallel circuits connected?

A

Top to top
bottom to bottom

65
Q

How are series circuits connected

A

end to end in a row

66
Q

parallel capacitor as in side by side have —— potential difference between the two electrode

Why?

A

the same

67
Q

If capacitor C1, C2 and C3 are in parallel, their equivalent capacitance is

A
68
Q

voltage in a series circuit compared to battery source

A

The voltage of the battery is the sum of all voltage of the components in a circuit.

69
Q

series capactitors have the same —–as—–

A

charge on each

70
Q

series capactitors have the same —–as—–

A

the same current as there is only one path to follow

71
Q

replacing two series capacitor with an equivalent capacitor. What is diff/the same with the charge and voltage?

A
72
Q

replacing two parallel capacitor with an equivalent capacitor. What is diff/same with the charge and voltage?

A
73
Q

equivalent capacitance in series circuit

A
74
Q

Explain how to set up equvalent capacitor equation for series circuit

A

So we know the charge is the same on every capacitor so for equavalent capacitor, the charge is the same as all the individual capacitor. Then since C=Q/V you find V. The V should be the source of the battery voltage as the sum of the voltage drops in a series circuit equals the total source voltage.

75
Q

Explain how to set up equvalent capacitor equation for parallel circuit

A

C=Q/V

Q= Q1+Q2+Q3…..

V is the same as the individual parallel circuits

76
Q

capacitance potential energy/ energy stored formula (2)

The two formulas

A
77
Q

When do you use U=qV and U=1/2cV^2?

A

When working with capacitors, you use U=1/2qV. U=qV is used when looking at the potential energy of a charge in a point in space.

78
Q

power in terms of Energy and time

A

P=E/T

79
Q

tell me which two equation can you use to find capacitance value of parallel capacitor with enot, d and A included

A

Use C=Q/V

Sub V as Ed

Rearrange and Sub Q in with E=n/enot which is E=Q/Aenot

80
Q

electric field for dipole on y axis (same axis) no the y3 one the one where r is not bigger then length

+What does S mean?
+What does q mean?

A

where S is distance between the two dipole

q=charge of the dipole you can multiply it into the equation and sub in values if the two point charge in dipole r diff

81
Q

Electric field formula with V and s

A
82
Q

If Equipotential lines are closer to each other at a region, it means ….

A

the electric field is strong at that region

83
Q

Electric field is—— in a region where potential isnt changing

A

0

84
Q

What is the energy conversion between a capacitor that is wired with a battery and then discharged to make a bulb shine?

A

Potential energy in capacitor transform into kinectic energy to make the charges move and make a current

85
Q

Electrical Potential energy = kQq/r when you put the values of the charges into the formula, you must …

A

include the signs ( positive or negative).

Physics 223 (3 decks)

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