Magnetism and Matter Test 2

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Magnetism and Matter Test 2

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Question 1
1 / -0

What is the unit of susceptibility?

A
Am^-1

B
Am²

C
No units

D
Am

Solution

In electromagnetism the magnetic susceptibility (Latin: susceptibilis, “receptive”; denoted X) is a measure of how much a material will become magnetized in an applied magnetic field. Mathematically, it is the ratio of magnetization M(magnetic moment per unit volume) to the applied magnetizing field intensity H.
Question 2
1 / -0

The magnetic induction left behind in the sample after the magnetizing field has been removed is called

A
Hyteresis

B
Retentivity

C
Coercivity

D
Ferromagnetism

Solution

Remanence or remanent magnetization or residual magnetism is the magnetization left behind in a ferromagnetic material (such as iron) after an external magnetic field is removed. It is also the measure of that magnetization. Colloquially, when a magnet is "magnetized" it has remanence.The remanence of magnetic materials provides the magnetic memory in magnetic storage devices, and is used as a source of information on the past Earth's magnetic field in paleomagnetism.The equivalent term residual magnetization is generally used in engineering applications. In transformers, electric motors and generators a large residual magnetization is not desirable (see also electrical steel) as it is an unwanted contamination, for example a magnetization remaining in an electromagnet after the current in the coil is turned off. Where it is unwanted, it can be removed by degaussing.Sometimes the term retentivity is used for remanence measured in units of magnetic flux density.
Question 3
1 / -0

Declination is the angle between:

A
horizontal and vertical components of earth’s magnetic field

B
horizontal component and total magnetic field of the earth

C
geographic and magnetic meridian

D
geographic meridian and horizontal component of earth’s magnetic field

Solution

Magnetic declination is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north (the direction along a meridian towards the geographic North Pole).
Question 4
1 / -0

The ferromagnetic materials can be magnetised easily because

A
Ferromagnetic materials have low susceptibility and permeability

B
Ferromagnetic materials have high susceptibility and low permeability

C
Ferromagnetic materials have high susceptibility and permeability

D
Ferromagnetic materials have low susceptibility and high permeability

Solution

Such materials are called ferromagnetic, after the Latin word for iron, ferrum. Not only do ferromagnetic materials respond strongly to magnets (the way iron is attracted to magnets), they can also be magnetized themselves—that is, they can be induced to be magnetic or made into permanent magnets.
Question 5
1 / -0

What kinds of materials are used for coating magnetic tapes?

A
Diamagnetic Materials

B
Ferrites

C
Electromagnet

D
Paramagnetic materials

Solution

Ceramics are used for coating magnetic tapes in a cassette player or for building memory stores in a modern computer. Ceramics are specially treated barium-iron oxides and are also called ferrites.
Question 6
1 / -0

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

A
q and m

B
ω and q

C
ω, q and m

D
ω and m

Solution

To find the magnetic moment due to a single particle, it is advisable to consider the equivalent current due to it
Question 7
1 / -0

A wire of length L m carrying current i A is bent in the form of a circle. The magnitude of magnetic moment is

A

B

C

D

Solution

If r is the radius of the circle,
then L=2πr or, r=L/2π
Area=A=πr²=πL²/4π²= L²/4π
Magnetic Moment=IA= IL²/4π
Question 8
1 / -0

If the susceptibility of a metal at saturation is 4500, then what is the permeability of this metal at saturation?

A
5.684 X 10^-4 T-m/A

B
5.654 X 10^-3 T-m/A

C
5.654 X 10^-7 T-m/A

D
5.658 X 10^-5 T-m/A

Solution

μ_r=μ/μ₀
μ= μ_r x μ₀
μ=4500 x 4πx 10^-7
μ=56520x10^-7
μ=5.652x10^-3
Question 9
1 / -0

The maximum value of permeability of a metal (77% Ni , 16% Fe , 5% Cu , 2% Cr) is 0.164 T-m/A. What will be the maximum relative permeability and susceptibility?

A
1.0101 X 10⁷ , 1.0102 X 10⁷

B
1.304 X 10⁵ ; ~ 1.304 X 10⁵

C
1.0102 X 10⁷ , 1.0101 X 10⁷

D
1.0101 X 10⁵ , 1.0102 X 10⁵
Question 10
1 / -0

The units of magnetic pole strength and magnetic dipole moment of a bar magnet are

A
A-m, JT^-1

B
JT^-1, Am^-1

C
JT^-1, Am

D
Am^-1, JT^-1

Solution

The units of magnetic pole strength is (A-m) and magnetic dipole moment of a bar magnet is (JT-¹)

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Re-Attempt Weekly Quiz Competition

Magnetism and Matter Test 2

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Magnetism and Matter Test 2

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Question 1

Am-1

Am2

No units

Am

Solution

Question 2

Hyteresis

Retentivity

Coercivity

Ferromagnetism

Solution

Question 3

horizontal and vertical components of earth’s magnetic field

horizontal component and total magnetic field of the earth

geographic and magnetic meridian

geographic meridian and horizontal component of earth’s magnetic field

Solution

Question 4

Ferromagnetic materials have low susceptibility and permeability

Ferromagnetic materials have high susceptibility and low permeability

Ferromagnetic materials have high susceptibility and permeability

Ferromagnetic materials have low susceptibility and high permeability

Solution

Question 5

Diamagnetic Materials

Ferrites

Electromagnet

Paramagnetic materials

Solution

Question 6

q and m

ω and q

ω, q and m

ω and m

Solution

Question 7

Solution

Question 8

5.684 X 10-4 T-m/A

5.654 X 10-3 T-m/A

5.654 X 10-7 T-m/A

5.658 X 10-5 T-m/A

Solution

Question 9

1.0101 X 107 , 1.0102 X 107

1.304 X 105 ; ~ 1.304 X 105

1.0102 X 107 , 1.0101 X 107

1.0101 X 105 , 1.0102 X 105

Question 10

A-m, JT-1

JT-1, Am-1

JT-1, Am

Am-1, JT-1

Solution

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Am^-1

Am²

5.684 X 10^-4 T-m/A

5.654 X 10^-3 T-m/A

5.654 X 10^-7 T-m/A

5.658 X 10^-5 T-m/A

1.0101 X 10⁷ , 1.0102 X 10⁷

1.304 X 10⁵ ; ~ 1.304 X 10⁵

1.0102 X 10⁷ , 1.0101 X 10⁷

1.0101 X 10⁵ , 1.0102 X 10⁵

A-m, JT^-1

JT^-1, Am^-1

JT^-1, Am

Am^-1, JT^-1