Magnetism and Matter Test 29

Result

Magnetism and Matter Test 29

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Weekly Quiz Competition

Question 1
1 / -0

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
Anti ferromagnetism 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
1 / -0

Mark the correct set of ferromagnetic substances.

A
Iron, cobalt and nickel

B
Iron, copper and lead

C
Silicon, bismuth and nickel

D
Aluminium, sodium and copper

Solution

Iron, cobalt and nickel are the examples of ferromagnetic material.
Question 3
1 / -0

Out of soft iron and steel which has more coercivity, less retentivity.

A
iron

B
steel

C
both are equal

D
can't say

Solution

Coercivity is the intensity of the applied magnetic field required to reduce the magnetization of a given material to zero. In other words to coerce the material to surrender its magnetism. Retentivity is the capacity of an object to retain magnetism after the action of the magnetizing force has ceased.
Question 4
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The susceptibility of a diamagnetic substance is

A
$$\infty$$

B
zero

C
Small but negative

D
Small but positive

Solution
Question 5
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Consider the following statements I and II.
(I) Paramagnetism is explained by domain theory
(II) Susceptibility of a diamagnetic substance is independent of temperature.
Identify the correct choice from the following.

A
Both I and II are correct

B
Both I and II are incorrect

C
I is correct and II is incorrect.

D
I is incorrect and II is correct

Solution
Question 6
1 / -0

Domain formation is the necessary features of

A
Diamagnetism

B
Paramagnetism

C
Ferromagnetism

D
All of these

Solution

Ferromagnetism materials exhibit a long range ordering phenomenon at the atomic level which causes the unpaired electron spins to line up parallel with each other in a region called domain. Within the domain, the magnetic field is intense, but in a bulk sample the material will usually be unmagnetised because the many domains will themselves be randomly oriented with respect to one another. Hence, domain formation is the necessary feature of ferromagnetic substance.
Question 7
1 / -0

Susceptibility is positive and small for

A
Paramagnetic substances

B
Ferromagnetic substances

C
Non-magnetic substances

D
Diamagnetic substances

Solution

Magnetic susceptibility is the degree of magnetism of a material in response to an applied magnetic field.
Lines of force are weakly attracted towards paramagnetic materials, when these materials are placed in external magnetic field. It means paramagnetic materials are weakly effected by the field. Therefore the susceptibility of paramagnetic materials is positive but small.
Question 8
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The graph of X versus T for a paramagnetic substance will look like

A

B

C

D

Solution

Paramagnetism: This class of materials, some of the atoms or ions in the material have a net magnetic moment due to unpaired electrons in partially filled orbitals. One of the most important atoms with unpaired electrons is iron. However, the individual magnetic moments do not interact magnetically, and like diamagnetism, the magnetization is zero when the field is removed. In the presence of a field, there is now a partial alignment of the atomic magnetic moments in the direction of the field, resulting in a net positive magnetization and positive susceptibility
Question 9
1 / -0

Which of the following statements is incorrect about hysteresis?

A
The effect is common to all ferromagnetic substances.

B
The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material.

C
The hysteresis loop area is independent of the thermal energy developed per unit volume of the material.

D
The shape of the hysteresis loop is characteristic of the material.

Solution
Question 10
1 / -0

The earth's magnetic induction at a certain point is $$7\times 10^{-5}Wb/m^2$$. This is to be annulled by the magnetic induction at the centre of a circle conducting loop of radius $$15$$ cm. The required current in the loop is

A
$$0.56A$$

B
$$5.6A$$

C
$$0.28A$$

D
$$2.8A$$

Solution