EMAGS

Question 1

∇f

Answer 1

Notation for Gradient

Question 2

Meaning of a negative divergence

Answer 2

“sink” point of flux

Question 3

Coordinates can be numerically equal to their vector components at any scale of representation. (True or False)

Answer 3

True

Question 4

Which of the following is NOT a vector?
A) ∇F
B) ∇xF
C) ∇*F
D) ∇

Answer 4

D) ∇

Question 5

The displacement vector always has a magnitude of 1. (True or False)

Answer 5

False

Question 6

The actual 3D vector is the resultant vector formed by the individual component vector in all three axes. (True or False)

Answer 6

True

Question 7

Which of the following is the dot product for two of the same unit vectors?
A) 0
B) π
C) 1
D) ∞

Answer 7

C) 1

Question 8

All coordinates start from the origin (0,0,0) point. (True or False)

Answer 8

True

Question 9

Which of the following is the maximum value for the θ in spherical coordinates?
A) 360°
B) 45°
C) 90°
D) 180°

Answer 9

D) 180°

Question 10

Which of the following is the notation for Divergence?
A) ∇
B) ∇*F
C) ∇F
D) ∇xF

Answer 10

B) ∇*F

Question 11

The del is technically a vector. (True or False)

Answer 11

True

Question 12

The Gauss’ Divergence is for surface integral. (True or False)

Answer 12

true

Question 13

Ampere’s Law is an application of a closed-loop line integral. (True or False)

Answer 13

True

Question 14

Which of the following is the cross product for two of the same unit vectors?
A) ∞
B) 0
C) π
D) 1

Answer 14

B) 0

Question 15

Which of the following is the meaning of a positive divergence?
A) “source” point of flux
B) convergence
C) no meaning at all
D) “sink” point of flux

Answer 15

A) “source” point of flux

Question 16

The resultant vector of a cross product is perpendicular to ____________.
A) neither vector factors
B) the second vector factor
C) the first vector factor
D) both vector factors

Answer 16

D) both vector factors

Question 17

The Green’s Theorem is for surface integral. (True or False)

Answer 17

False

Question 17

A negative magnitude for a scalar exists. (True or False)

Answer 17

True

Question 18

The purpose of the unit vector is as a directional or pointer vector. (True or False)

Answer 18

True

Question 19

Which of the following is the notation for the Curl?
A) ∇*F
B) ∇
C) ∇xF
D) ∇F

Answer 19

C) ∇xF

Question 20

Ability of a material to store charges in an electric field?
A) Voltage
B) Permittivity
C) Flux
D) Capacitance

Answer 20

D) Capacitance

Question 21

Given a particular area of a sheet charge, thetoal charge it contains can be determined given the area charge density. (True or False)

Answer 21

True

Question 22

Which of the following the applied potential energy per change?
A) Electric Flux
B) Electric Potential
C) Voltage
D) Electric Field

Answer 22

B) Electric Potential

Question 23

Electric Field strength from a point charge, decreases as the distance away from the said point charge increases. (True or False)

Answer 23

True

Question 24

Increasing the cross sectional area of the plates of a capacity, the more capacitance it has, given that the separation between plates remains constant. (True or False)

Answer 24

True

Question 25

Voltage is the difference e in electric potential energy per charge. (True or False)

Answer 25

True

Question 26

The area vector, if parallel to the electric field vector, means that the electric flux through that cross sectional area is at minimum. (True or False)

Answer 26

False

Question 27

To determine the "D"-field, given the electric field, the permittivity of the material to which the electric field passes is multiplied to the "D"-field. (True or False)

Answer 27

False

Question 28

Higher relative permittivity also means a higher value for the Coulomb's constant "k".

Answer 28

False

Question 29

Electric Potential energy is like mechanical potential energy wherein energy increases with an increase in displacement or distance.

Answer 29

False

Question 30

At what angle should the area vector be relative to the electric field vector to have only 50% of the possible maximum electric flux passes through?

Answer 30

60°

Question 31

If the sphere charge is positive, the electric field at a distance away is pointed towards said sphere charge. (True or False)

Answer 31

False

Question 32

The dialectric constant of a solid material, in effect...increases generally, the permitivity of said material compare to that of air.(T OR F

Answer 32

True

Question 33

The study of magnetic fields in systems where the electric currents are steady (not changing with time).

Answer 33

Magnetostatics

Question 34

It is the magnetic analogue (equivalent) of electrostatics, where the charges and field are stationary.

Answer 34

Magnetostatics

Question 35

Magnets two poles?

Answer 35

North and South

Question 36

Magnets are _____.

Answer 36

inherently dipole

Question 37

This is analogous to the electric charges (either negative or positive), but in a magnet the poles CANNOT be separated to as "Purely North" or "Purely South". (True or False)

Answer 37

True

Question 38

The measure of the ability of a material to support the formation of a magnetic field within itself.

Answer 38

Permeability (μ)

Question 39

is the region around within which the force of magnetism acts.

Answer 39

Magnetic Field

Question 40

is present around ; poles of magnetic material ; moving electric charge ; and even planets.

Answer 40

Magnetic Field

Question 41

Law that is valid in the magnetostastic approximation.

Answer 41

Biot-Savart Law

Question 42

States that the divergence of the magnetic field and a closed area of space over a magnetic material is zero. Because the magnetic lines of force starts and ends in the SAME magnetic material.

Answer 42

Gauss' Law (For Magnetism)

Question 43

magnetic analogue of Gauss' Law

Answer 43

Ampere's Law

Question 44

states that for any closed loop path, the sum of the length elements (line integral) times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop.

Answer 44

Ampere's Law

Question 45

moving charge

Answer 45

Magnetic Force

Question 46

When an electric current flows in a closed loop of wire placed in an external magnetic field

Answer 46

Magnetic Torque (τB)

Question 47

the magnetic force on the current can produce ______.

Answer 47

Torque