EMAGS FINALS

Question 1

1. Measure of the flow of the electric field through an area in space.

Answer 1

Electric Flux (ΦE)

Question 2

2. The dot product or divergence of the ‘electric field’ and the area vectors.

Answer 2

Electric Flux (ΦE)

Question 3

Measure of the flow of charged particles from an area or surface influenced by an electric field.

Answer 3

Electric Displacement Field (D)

Question 4

1. Measure of how many charged particles were displaced by the influence of an electric field.

Answer 4

Electric Displacement Flux (ΦD)

Question 5

2. The dot product or divergence of the ‘electric displacement field’ and the area vectors.

Answer 5

Electric Displacement Flux (ΦD)

Question 6

States that the electric flux through any closed surface is proportional to the net electric charge enclosed by that surface.

Answer 6

Gauss’ Law for Electricity

Question 7

Gauss’ Law for Electricity is contributed by the great Mathematician, ___________________?

Answer 7

Carl Friedrich Gauss

Question 8

It provided a much simpler method of determining the electric field from a charged body.

Answer 8

Gauss’ Law for Electricity

Question 9

It uses an imaginary closed surface (Gaussian Surface or GS) to which the flux enters or exits.

Answer 9

Gauss’ Law for Electricity

Question 10

Similar to the electric flux - it describes how much magnetic field lines are passing through the open area (wire loop).

Answer 10

H-Magnetic Flux (ΦH) or B-Magnetic Flux (ΦB)

Question 11

is called the magnetic flux density

Answer 11

B-Magnetic Flux (ΦB)

Question 12

is the magnetic flux intensity

Answer 12

H-Magnetic Flux (ΦH)

Question 13

is the field generated by a current

Answer 13

H-Magnetic Flux (ΦH)

Question 14

is the response of the medium to the present H

Answer 14

B-Magnetic Flux (ΦB)

Question 15

In free space, B is just __________ to H since there’s no medium present that needs to be __________

Answer 15

proportional, magnetized.

Question 16

This is a set of equations that basically describes the behavior of electromagnetic waves

Answer 16

Maxwell’s Equations

Question 17

It has four equations, two each for _______ and ___________ waves. Each equations shows the parallelism between the electric and magnetic quantities.

Answer 17

electric and magnetic

Question 18

Maxwell’s Equations were originally based on:

Answer 18

Gauss’ Law,
Faraday’s Law and
Ampere’s Law.

Question 19

Maxwell’s published this work between ______ to _______?

Answer 19

1861 to 1862.

Question 20

∇ · E = ρ/ε

Answer 20

Equation 1: Gauss’ Law for Electricity

Question 21

The total electric flux coming through or out a closed surface is proportional to the charge enclosed.

Answer 21

Equation 1: Gauss’ Law for Electricity

Question 22

used to obtain the electric field strength away from a point, line, volume and surface charge.

Answer 22

Equation 1: Gauss’ Law for Electricity

Question 23

the differential form shows that the divergence of the electric field is proportional to the charge density (ρ) of the source.

Answer 23

Equation 1: Gauss’ Law for Electricity

Question 24

∇ · B = 0

Answer 24

Equation 2: Gauss’ Law for Magnetism

Question 25

The total magnetic flux coming through or out a closed surface is zero.

Answer 25

Equation 2: Gauss’ Law for Magnetism

Question 26

Similar to the 1st equation but applied to the magnetic field (B). This simply states that there is no divergence for magnetic fields as these are closed loops.

Answer 26

Equation 2: Gauss’ Law for Magnetism

Question 27

∇ × E = −∂B/∂t

Answer 27

Equation 3: Faraday’s Law of Electric Induction

Question 28

A changing magnetic field induces an electric field.

Answer 28

Equation 3: Faraday’s Law of Electric Induction

Question 29

The differential form shows that the electric field lines curl (perpendicular) to magnetic field lines

Answer 29

Equation 3: Faraday’s Law of Electric Induction

Question 30

∮E · dL = −∂ΦB/∂t

• leads to the principle that a changing magnetic field induces voltage (EMF) in a conductor wire or coil.

Answer 30

Integral Form of Equation 3: Faraday’s Law of Electric Induction

Question 31

∇ × B = μJ + με (∂E/∂t)

Answer 31

Equation 4: Modified Ampère’s Law for Induced Magnetic Field and Flux

Question 32

A changing electric field induces a magnetic field.

Answer 32

Equation 4: Modified Ampère’s Law for Induced Magnetic Field and Flux

Question 33

The differential form shows that the magnetic field lines curl (perpendicular) to electric field lines.

Answer 33

Equation 4: Modified Ampère’s Law for Induced Magnetic Field and Flux

Question 34

∮B · dL = μI + με(∂ΦE /dt)
= μI + μId
= μ(I + Id)

• Here Maxwell defines a displacement current (Id) in order show that changing electric field induces a magnetic field.

Answer 34

Integral Form of Equation 4: Modified Ampère’s Law for Induced Magnetic Field and Flux

Question 35

the speed of propagation of electromagnetic (EM) waves was the same as the speed of light.

Answer 35

Electromagnetic Propagation in Space

Question 36

was the first to prove mathematically that the speed of propagation of electromagnetic (EM) waves was the same as the speed of light.

Answer 36

Maxwell

Question 37

is also an EM wave was derived.

Answer 37

Visible light

Question 38

derived using the particle theory of light.

Answer 38

Speed of Light (c)

Question 39

speed of light represented by the symbol c. Stands for the initial letter of the Latin word “_______” meaning “______” or “_______”.

Answer 39

celerity, swift or quick

Question 40

Complied and Unified Electromagnetic Equations by

Answer 40

James Clerk Maxwell