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D) Physics > Electromagnetic Fields > Flashcards

Electromagnetic Fields Flashcards

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0
Q

Permiability ε

A

The ability of a substance to support the formation of an electromagnetic field within itself

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1
Q

Magnetic Moment

A

Magnetic quantity that describes both the force and torque that a magnetic field will exert on an electric current

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2
Q

Premativity ε0

A

The ability of a resist to support the formation of an electromagnetic field within itself

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3
Q

Representing electromagnetic fields

A

Always in a vector field in continuous Structure

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4
Q

Electron behavior in a field

A

Moves from the positive end, orthogonal to the surface, to the negative end, at an angle orthogonal to the surface

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5
Q

Electromagnetic Field

A

A feedback loop between the electric field and the magnetic field, generated by the electric charges

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6
Q

Electromagnetic feedback loop

A

1) Electrical charges produce electrical and magnetic fields
2) The electrical field interacts with the magnetic field (opposite to the electrical field)
3) Field acts on particles in the surrounding space, creating forcefields (electrical force: same direction as electrical field, magnetic force: perpendicular to the magnetic field)
4) Particles begin to move, creating a current
5) Particle movement generates more fields

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7
Q

Electromagnetic Field vector components

A

Electrical: E(x,y,z,f)
Magnetic: B(x,y,z,f)

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8
Q

Isolated electrical field

A

Electrostatic field, never with a time component

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9
Q

Isolated magnetic field

A

Magnetostatic field, never with a time component

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10
Q

Maxwell’s equations

A

1) Gauss’ Law
2) Gauss’ Law for magnetism
3) Faraday’s Law
4) Ampere-Maxwell’s Law

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11
Q

Gauss’ Law

A

Electric flux of an object is equal to its charge divided by its permeability, or the surface integral of the electromagnetic field with respect to area
Φ=Q/ε=∫∫E⊙dA
Meaning the dot-product of the gradient and the electrostatic field is charge density over material permeability
∇⊙E=p/ε

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12
Q

Gauss’ Law for Magnetism

A

The dot-product of the gradient and the magnetostatic field is zero
∇⊙B=0
∫∫E⊙dA=0

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13
Q

Faraday’s Law

A

Curl of an electrostatic field is the negative differential equation for magnetostatic B over t
∇xE=-∂B/∂t

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14
Q

Ampere-Maxwell’s Law

A

Curl of a magnetostatic field is the sum of the current-density magnet-constant product and the (differential E with t)(magnet constant)(permeability constant)
∇xE=μJ+εμ(∂E/∂t)

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15
Q

Review the study portion for vector calculus

A

Do it now

16
Q

Electrical displacement

A

D=μE+P

P=Polarization
E=Field strength
ε0=Permativity

17
Q

Function for the electrostatic field

A

E(x,y,z)=F(x,y,z)/q

18
Q

Electrical potential (voltage)

A

Φ=U/q

19
Q

Force Vector field

A

F=-∇U

Negative gradient of the energy vector field

20
Q

Electrostatic vector field

A

E=-∇Φ

Negative gradient of the voltage potential vector field

21
Q

Electrostatic field strength

A

|E|=-ΔΦ/d

Voltage difference between the plates, divided by the distance between them

22
Q

Electrical displacement vector field

A

D(r)=εE(r)

23
Q

Energy density

A

u=(1/2)ε0|E|^2

24
Q

Electrodynamic Lorenz force vector

A

Electromagnetic foce on a charged particle at a point
F=qE+(qv x B)

q=particle charge
E=electrostatic vector at that point
v=velocity of charge
B=magnetostatic vector at that point

25
Q

Electrostatic Force vector field

A

F=qE

26
Q

Charge density

A

Coulombs per unit of volume

27
Q

Polarization density

A

Molecular Dipole moment (always as a vector) per unit of Volume

28
Q

Right hand rule

A

Give a thumbs up…
If current flows up through your thumb,
Then the magnetic field generated travels in the direction indicated by your fingers

29
Q

System Capasitance

A

Ability of the system to store energy in its electric feild

30
Q

System Inductance

A

The ability of a system to store energy in its magnetic field

31
Q

Uniform Electromagnetic Force

A

Fe=q|E|

Product of charge and magnetude of the electromagnetic field

Given as culoumbs per meter=newtons

32
Q

Non-uniform Electromagnetic force

A

Fe=(910^9)q1q2/r^2

Basically, its the law for gravitational force, but with charged particles

33
Q

Uniform Electric Field Strength

A

E=F/qt

Electromagnetic force over the test charge

34
Q

Test charge (qt)

A

The charge the moves in the system

35
Q

Stationary charge (qs)

A

The charge that results in acceleration in the test charge

36
Q

Non-uniform electric field strength

A

E=k*qs/r^2

D) Physics (13 decks)

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