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University Physics > APH4002 Electricity, Magnatism & Electronics > Flashcards

APH4002 Electricity, Magnatism & Electronics Flashcards

1
Q

Define Fundamental Law

A

The algebraic sum (net charge) of all the electric charges is any closed system is constant

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2
Q

Define Conductors

A

Materials that allow the easy movement of charge through them

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3
Q

Give an example of a Conductor

A

Copper, Tap water, Human

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4
Q

Define Insulators

A

Materials that restrict the movement of charge through them

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5
Q

Give an example of an Insulator

A

Rubber, Glass, Pure water

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6
Q

Define Charging a Material by Induction

A

A charged material (e.g. copper rod) used to charge another material (e.g. metal ball)

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7
Q

What is Coulombs Law?

A

The magnitude of the electric force, |F|, between 2 stationary charges is directly proportional to the product of the charges & inversely proportional to the square of the distance between them

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8
Q

What is the Principle of Superposition?

A

Charges will interact independently in pairs

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9
Q

What is a flaw of Coulombs Law?

A

That it only describes the interaction of two stationary point charges

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10
Q

What is Gauss’ Law?

A

This relates the electric field at points on a Gaussian surface to the net charge enclosed by the Gaussian surface

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11
Q

What is a Gaussian Surface?

A

A surface to exploit symmetries of a problem to simplify the calculation of electric flex

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12
Q

What two things must a Gaussian Surface be?

A

Must be enclosed and be a 3D object

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13
Q

Define Conservative Force

A

A force that allows electrical energy to convert into potential energy & potential into kinetic

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14
Q

What is a Capacitor?

A

Made from two parallel plates, separated by d & have a dielectric/ vacuum middle connected to a source. Charges are same in magnitude but not in sign

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15
Q

Define Electric Current

A

Flow of charges in motion from one region to another
OR
Rate of transfer of charge across a cross section

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16
Q

Define Charge Conservation

A

The charge in the amount of electric charge in any volume of space is exactly equal to the amount of charge flowing in minus the charge flowing out

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17
Q

Define Current Density

A

Rate of charge flow per unit area
OR
Net flow of +ive charges at dA

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18
Q

Define Direct Current

A

The unidirectional flow of charges

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19
Q

Define Magnetic Permeability

A

Degree of magnetization that a material obtains in response to an applied magnetic field

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20
Q

Define Electromagnetic Induction

A

The production of an induced emf with the aid of a magnetic field

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21
Q

What is an Electric Generator?

A

Produce electricity by transforming mechanical energy into electrical energy

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22
Q

What is Faraday’s Law?

A

The induced emf in a closed loop equals the negative of the time rate if change of magnetic flux through a loop

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23
Q

Define Mutual Induction

A

A current in the primary coil induces a current in the secondary coil

24
Q

Define Self Induction

A

When a changing current in a circuit induces an emf in the same circuit

25
Q

Define Resonance

A

The peaking of the current amplitude at a certain frequency

26
Q

What is Lenz’s Law?

A

The current induced will oppose the force that crated it

27
Q

Define Optoelectronics

A

The manipulation of electromagnetic radiation using electronic devices

28
Q

What is Thevmin’s Theorem?

A

Any circuit consisting of resistors and emf’s has an equivalent circuit consisting of a single voltage source, Vth, in a series with a resistor, Rth

29
Q

What is Pauli’s exlusion principle?

A

No two electrons shall have the same set of quantum numbers

30
Q

What is the Electrostatic Force vector sum equation

A

Fnet= ΣFn

31
Q

What is the equation for a Gaussian Surface?

A

Φ=SEcos(θ)

32
Q

What is the equation for electric dipoles

A

p=qxd

33
Q

What is the equation for Electrical Force

A

F=Eq

34
Q

What is the mathematical form of Coulombs Law?

A

F= 1/4πε0 x q1q2/r^2

35
Q

What is the equation for Potential Energy?

A

U=-q0E

36
Q

What is the mathematical form of Work Done?

A

W=-U=-(-q0E)=q0E

37
Q

What is the generalised equation for Capacitance?

A

C=q/v

38
Q

What is the equation for capacitance of parallel plates?

A

C=ε0A/d

39
Q

What is the equation for capacitance in a cylinder?

A

C= 2πε0 (L/ln(a/b))

40
Q

What is the equation of capacitance for a sphere?

A

C=4πε0 an/a-b

41
Q

What is the equation for capacitance in parallel?

A

C total=ΣCi

42
Q

What is the equation for capacitance in series?

A

C total= Σ 1/Ci

43
Q

What is the equation for Potential energy involving capacitance?

A

U=(Q^2)/2C = (CV^2)/2

44
Q

What is the mathematical definition for Charge Conservation?

A

Q=Qin - Qout

45
Q

What is the mathematical definition of current?

A

I=dQ/dt

46
Q

What is the equation for current density?

A

J=I/A

47
Q

What is the equation for current involving Drift Velocity?

A

I=nAve

48
Q

What is the equation for Ohms law

A

R=V/I

49
Q

What is the equation for power?

A

P=IV

50
Q

What is the equation for work done?

A

W=ItV

51
Q

What is the mathematical equation for Kirchoff’s junction rule?

A

ΣI=0

52
Q

What is the mathematical definition for Kirchoff’s loop rule?

A

ΣV=0

53
Q

What is the the equation for force involving magnetic force?

A

|F|=|q| |v| |B| sinφ

54
Q

What is the equation for the Lorentz’s Force?

A

F= q(R+v x B)

55
Q

What is the exponential equation for charge?

A

q=Qf(1-e^(-t/RC)

56
Q

What does qvB equal?

A

Force

University Physics (2 decks)

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