Magnetism and Matter Test 27

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Magnetism and Matter Test 27

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Question 1
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Permanent magnets are the substances having the property of

A
ferromagnetism at room temperature for a long period of time.

B
paramagnetism at room temperature for a long period of time.

C
antiferromagnetism at room temperature for a long period of time.

D
diamagnetism at room temperature for a long period of time.

Solution

Permanent magnets are those substances that retain their ferromagnetic property for a long period of time at room temperature.
Question 2
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Core of electromagnets are made of ferromagnetic material which have

A
low permeability and low retentivity

B
high permeability and high retentivity

C
high permeability and low retentivity

D
low permeability and high retentivity

Solution

Core of electromagnets are made of soft iron that is a ferromagnetic material with high permeability and low retentivity.
Question 3
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The hysteresis cycle for the material of a transformer core is:

A
short and wide

B
tall and narrow.

C
tall and wide

D
short and narrow

Solution

Transformer core is soft iron material which has small coercivity and large retentivity. Therefore its hysteresis loop is tall and narrow.
Question 4
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The temperature of transition from ferromagnetic property to paramagnetic property is called as:

A
Transition temperature

B
Critical temperature

C
Curie temperature

D
Triplet temperature

Solution

Curie Temperature$$(T_{c})$$
Question 5
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Some equipotential surfaces of the magnetic scalar potential are shown in figure.Magnetic field at a point in the region is

A
$$10^{-4}$$ T

B
$$0.5 \times 10^{-4}$$ T

C
$$2 \times 10^{-4}$$ T

D
None of these

Solution

As is clear from figure

$$\triangle V = (0.2 - 0.1) 10^{-4} Tm$$
$$\triangle x = x sin 30^0 = 0.1 \times \dfrac{1}{2}$$
$$\therefore |B| = \dfrac{\triangle V}{\triangle x} = \dfrac{0.1 \times 10^{-4}}{0.1 /2} = 2 \times 10^{-4}T$$
Question 6
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Assertion : When diamagnetic material is placed in a non-uniform magnetic field, it tends to move from stronger to the weaker part of the magnetic field.
Reason : Diamagnetic materials possess strong magnetism.

A
If both assertion and reason are true and reason is the correct explanation of assertion.

B
If both assertion and reason are true and reason is not the correct explanation of assertion.

C
If assertion is true but reason is false.

D
If both assertion and reason are false.

Solution

Electrons is an atom orbiting around nucleus possess orbital angular momentum. These orbiting electrons are equivalent to current-carrying loop and thus possess orbital magnetic moment. Diamagnetic substances are the ones in which resultant magnetic moment in an atom is zero. When magnetic field is applied, those electrons having orbital magnetic moment in the same direction slow down and those in the opposite direction speed up. Thus, the substance develops a net magnetic moment in direction opposite to that of the applied field.
Question 7
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Assertion : The product of magnetic susceptibility and absolute temperature for a paramagnetic substance is constant.
Reason : Susceptibility is positive but very small for paramagnetic substance.

A
If both assertion and reason are true and reason is the correct explanation of assertion.

B
If both assertion and reason are true and reason is not the correct explanation of assertion.

C
If assertion is true but reason is false.

D
If both assertion and reason are false

Solution

The susceptibility of a paramagnetic substance is inversely proportional to absolute temperature.
$$X \propto \frac{1}{T}$$
Hence $$XT = constant$$
Also for paramagnetic substances the susceptibility is positive and very small.
Question 8
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Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show the

A
anti ferromagnetism

B
no magnetic property

C
diamagnetism

D
paramagnetism

Solution

Correct Option is D.
Explanation for the correct answer:
$$\bullet$$ Curie Temperature is that temperature above which there is sharp change in magnetic properties of all the magnetic substances all. All the Ferromagnetic Material becomes Paramagnetic Material above Curie Temperature.
$$\bullet$$ Thus, if a temperature of Nickel which is a Ferromagnetic Material is increased above Curie Temperature, then it becomes Paramagnetic.

This, Nickel will show Paramagnetic behavior above Curie Temperature. Option D is correct.
Question 9
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Assertion : When a bar magnet is freely suspended it points in the north - south direction.
Reason : The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to north

A
If both assertion and reason are true and reason is the correct explanation of assertion.

B
If both assertion and reason are true and reason is not the correct explanation of assertion.

C
If assertion is true but reason is false.

D
If both assertion and reason are false

Solution

The magnet align itself in north-south direction, when it is freely suspended because earth behaves as a magnet.
Question 10
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A domain in ferromagnetic iron is in the form of a cube of side length 2$$\mu $$ m then the number of iron atoms in the domain are (Molecular mass of iron = $$55 g mol^{-1}$$ and density = $$7.92 g cm^{-3}$$), maximum value of magnetisation of the given domain is (Dipole moment of an iton atom $$9.27 \times 10^{-24}A m^2)$$

A
$$8.0 \times 10^5 A m^{-1}$$

B
$$6.0 \times 10^4 A m^{-1}$$

C
$$8.0 \times 10^3 A m^{-1}$$

D
$$6.0 \times 10^3 A m^{-1}$$

Solution

Net dipole moment, $$M_N = N \times m = 6.92 \times 10^{11} \times 9.27 \times 10^{-24} = 6.4 \times 10^{-12} Am^2$$
Net magnetisation =$$ \dfrac{6.4 \times 10^{-12}}{8 \times 10^{-18}} = 8 \times 10^5 A m^{-1}$$

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Magnetism and Matter Test 27

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Question 1

ferromagnetism at room temperature for a long period of time.

paramagnetism at room temperature for a long period of time.

antiferromagnetism at room temperature for a long period of time.

diamagnetism at room temperature for a long period of time.

Solution

Question 2

low permeability and low retentivity

high permeability and high retentivity

high permeability and low retentivity

low permeability and high retentivity

Solution

Question 3

short and wide

tall and narrow.

tall and wide

short and narrow

Solution

Question 4

Transition temperature

Critical temperature

Curie temperature

Triplet temperature

Solution

Question 5

$$10^{-4}$$ T

$$0.5 \times 10^{-4}$$ T

$$2 \times 10^{-4}$$ T

None of these

Solution

Question 6

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true and reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

Solution

Question 7

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true and reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false

Solution

Question 8

anti ferromagnetism

no magnetic property

diamagnetism

paramagnetism

Solution

Question 9

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true and reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false

Solution

Question 10

$$8.0 \times 10^5 A m^{-1}$$

$$6.0 \times 10^4 A m^{-1}$$

$$8.0 \times 10^3 A m^{-1}$$

$$6.0 \times 10^3 A m^{-1}$$

Solution

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