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Engineering Physics Year 2 > Magnetism > Flashcards

Magnetism Flashcards

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1
Q

What is the Lorentz Force?

A

Magnetic forces always act perpendicular to the direction of the motion of the charged particles.

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2
Q

What is the Lorentz Force Law?

A

𝐅 = 𝑞 (𝐯 × 𝐁)

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3
Q

What is the Hall effect?

A
  • The Hall effect is the production of a potential difference (the Hall voltage) across an electrical conductor
  • that is transverse to an electric current in the conductor
  • and to an applied magnetic field
  • perpendicular to the current.
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4
Q

Give the parameters for the equation:

I = NevA

A

I = Current
N = Number of electrons per unit volume
e = Electronic charge
v = Drift velocity
A = Cross-sectional area of the bar

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5
Q

For Fleming’s left hand rule, state what each finger represents.

A

ThuMb = Motion / Force
First = Magnetic Field
SeCond = Current

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6
Q

What is the right hand curl rule for finding the direction of vector S for a current loop?

A

Thumb = S
Fingers = I

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7
Q

Explain why ε0 is known as permittivity of free space.

A

In vacuum, there are no molecules to be polarized, so 𝜀0 is called permittivity of vacuum of free space.

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8
Q

What is the magnetic dipole moment?

A

m = I x S

Where:
m = magnetic dipole moment
I = current
S = direction of wire

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9
Q

What are the units for the magnetic dipole moment?

A

A m^2

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10
Q

How could you find the direction of the magnetic dipole moment?

A

Fleming’s right hand rule.

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11
Q

What is the right hand curl rule for finding the direction of the magnetic field caused by a current in a wire?

A

Thumb = I
Fingers = B

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12
Q

What is µ0?

A

µ0 is the vacuum permeability

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13
Q

What is the value of µ0?

A

µ0 = 4π x 10^-7

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14
Q

What are paramagnetic materials?

A

Paramagnetic substances have a weak magnetism resulting from the presence of atoms (or ions) that have permanent magnetic moments.

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15
Q

What happens to the magnetic field of a solenoid if a paramagnetic material is placed inside?

A

Its atomic moments line up with the field.

The magnetic field has a small increase.

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16
Q

What are diamagnetic materials?

A

Diamagnetic materials have no magnetism.

E.g. water, wood, etc

17
Q

What happens to the magnetic field of a solenoid if a diamagnetic material is placed inside?

A

A weak magnetic moment is induced in the direction opposite to the magnetic field of the solenoid.

The magnetic field has a small decrease.

18
Q

What are ferromagnetic materials?

A

Ferromagnetic substances contain permanent atomic magnetic moments.

19
Q

What happens to the magnetic field of a solenoid if a ferromagnetic material is placed inside?

A

The permanent magnetic moments align parallel to each other in the direction of the solenoid’s magnetic field.

The magnetic field has a large increase.

20
Q

Explain how the magnitude of a magnetic field are represented by magnetic field lines.

A

The number of magnetic field lines per unit area (density of field lines) represents the magnitude.

21
Q

Explain how the direction of a magnetic field are represented by magnetic field lines.

A

The arrows on the field lines show the direction of the magnetic field.

22
Q

What is Farday’s Law of Induction?

A

ε = - dΦ(B) / dt

Where:
ε = induced voltage
dΦ(B) = change in magnetic flux
dt = change in time

23
Q

What is the magnetic flux through a solenoid?

A

Φ = (total number of turns) x (area of solenoid turn) x (magnetic field)

Φ = (NL) (πr^2) (B)

Where L is the self inductance

24
Q

What is the magnetic flux through a surface?

A

Φ(B) = ∫ B * dA

25
Q

What is the equation for a magnetic field due to a current-carrying wire at a distance r away?

A

B = µ0 I / 2πr

26
Q

What is the equation for angular frequency?

A

ω = 2π / T = v / r

27
Q

What is the equation for centripetal force?

A

F = mv^2 / r

28
Q

What is the equation to find the force per unit length between two wires?

A

F / ΔL = (µ0 I(1) I(2)) / (2πr^2)

Engineering Physics Year 2 (6 decks)

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