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EMAGS > EMAGS > Flashcards

EMAGS Flashcards

1
Q

∇f

A

Notation for Gradient

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2
Q

Meaning of a negative divergence

A

“sink” point of flux

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3
Q

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

A

True

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4
Q

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

A

D) ∇

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5
Q

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

A

False

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6
Q

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

A

True

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7
Q

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

A

C) 1

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8
Q

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

A

True

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9
Q

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

A

D) 180°

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10
Q

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

A

B) ∇*F

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11
Q

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

A

True

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12
Q

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

A

true

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13
Q

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

A

True

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14
Q

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

A

B) 0

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15
Q

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

A

A) “source” point of flux

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16
Q

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

A

D) both vector factors

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17
Q

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

A

False

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17
Q

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

A

True

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18
Q

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

A

True

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19
Q

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

A

C) ∇xF

20
Q

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

A

D) Capacitance

21
Q

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

A

True

22
Q

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

A

B) Electric Potential

23
Q

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

A

True

24
Q

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)

A

True

25
Q

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

A

True

26
Q

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)

A

False

27
Q

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)

A

False

28
Q

Higher relative permittivity also means a higher value for the Coulomb’s constant “k”.

A

False

29
Q

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

A

False

30
Q

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?

A

60°

31
Q

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

A

False

32
Q

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

A

True

33
Q

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

A

Magnetostatics

34
Q

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

A

Magnetostatics

35
Q

Magnets two poles?

A

North and South

36
Q

Magnets are _____.

A

inherently dipole

37
Q

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)

A

True

38
Q

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

A

Permeability (μ)

39
Q

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

A

Magnetic Field

40
Q

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

A

Magnetic Field

41
Q

Law that is valid in the magnetostastic approximation.

A

Biot-Savart Law

42
Q

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.

A

Gauss’ Law (For Magnetism)

43
Q

magnetic analogue of Gauss’ Law

A

Ampere’s Law

44
Q

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.

A

Ampere’s Law

45
Q

moving charge

A

Magnetic Force

46
Q

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

A

Magnetic Torque (τB)

47
Q

the magnetic force on the current can produce ______.

A

Torque

EMAGS (5 decks)

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