Dielectric and Magnetic Properties - Solid State Physics - Physics Previous Year Questions

1

2007 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2007

When liquid oxygen is poured down close to a strong bar magnet, the oxygen stream is

A

repelled towards the lower field because it is diamagnetic.

B

attracted towards the higher field because it is diamagnetic.

C

repelled towards the lower field because it is paramagnetic.

D

attracted towards the higher field because it is paramagnetic.

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2

2007 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2007

A ferromagnetic mixture of iron and copper having 75% atoms of Fe exhibits a saturation magnetization of \( 1.3 \times 10^6 \) A m\(^{-1}\). Assume that the total number of atoms per unit volume is \( 8 \times 10^{28} \) m\(^{-3}\). The magnetic moment of an iron atom, in terms of the Bohr Magneton, is

A

1.7

B

2.3

C

2.9

D

3.8

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3

2007 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2007

A ferromagnetic mixture of iron and copper having 75% atoms of Fe exhibits a saturation magnetization of \(1.3 \times 10^6\) A m\(^{-1}\). Assume that the total number of atoms per unit volume is \(8 \times 10^{28}\) m\(^{-3}\). The magnetic moment of an iron atom, in terms of the Bohr Magneton, is

A

1.7

B

2.3

C

2.9

D

3.8

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4

2008 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2008

The plot of inverse magnetic susceptibility \(1/\chi\) versus temperature \(T\) of an antiferromagnetic sample corresponds to

A

Image of option A

B

Image of option B

C

Image of option C

D

Image of option D

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5

2009 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2009

In an insulating solid which one of the following physical phenomena is a consequence of Pauli's exclusion principle ?

A

Ionic conductivity

B

Ferromagnetism

C

Paramagnetism

D

Ferroelectricity

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6

2009 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2009

The dependence of the magnetic susceptibility (\( \chi \)) of a material with temperature (\( T \)) can be represented by \( \chi \propto \frac{1}{T-\theta} \), where \( \theta \) is the Curie-Weiss temperature. The plot of magnetic susceptibility versus temperature is sketched in the figure, as curves P, Q and R with curve Q having \( \theta = 0 \). Which one of the following statements is correct?

A

Curve R represents a paramagnet and Q a ferromagnet

B

Curve Q represents a ferromagnet and P an antiferromagnet

C

Curve R represents an antiferromagnet and Q a paramagnet

D

Curve R represents an antiferromagnet and Q a ferromagnet

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7

2009 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2009

The dielectric constant of a material at optical frequencies is mainly due to

A

ionic polarizability

B

electronic polarizability

C

dipolar polarizability

D

ionic and dipolar polarizability

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8

2010 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2010

In an experiment involving a ferromagnetic medium, the following observations were made. Which one of the plots does NOT correctly represent the property of the medium? (\(T_c\) is the Curie temperature)

A

B

C

D

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9

2011 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2011

The temperature (T) dependence of magnetic susceptibility (χ) of a ferromagnetic substance with a Curie temperature (T_c) is given by
where C is constant.

A

C/(T - T_c), for T < T_c

B

C/(T - T_c), for T > T_c

C

C/(T + T_c), for T > T_c

D

C/(T + T_c), for all temperatures

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10

2011 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2011

The temperature ( T ) dependence of magnetic susceptibility (χ) of a ferromagnetic substance with a Curie temperature ( \( T_c \) ) is given by where C is constant.

A

\(\frac{C}{T - T_c} \), for \(T < T_c \)

B

\(\frac{C}{T - T_c} \), for \(T > T_c \)

C

\(\frac{C}{T + T_c} \), for \(T > T_c \)

D

\(\frac{C}{T + T_c} \), for all temperatures

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11

2012 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2012

Inverse susceptibility (1/χ) as a function of temperature, T for a material undergoing paramagnetic to ferromagnetic transition is given in the figure, where O is the origin. The values of the Curie constant, C, and the Weiss molecular field constant, λ, in CGS units, are

A

C = 5×10⁻³, λ = 3×10⁻²

B

C = 3×10⁻², λ = 5×10⁻⁵

C

C = 3×10⁻², λ = 2×10⁵

D

C = 2×10⁵, λ = 3×10⁻²

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12

2014 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2014

For Nickel, the number density is 8 × 10^23 atoms/cm^3 and electronic configuration is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^8 4s^2. The value of the saturation magnetization of Nickel in its ferromagnetic state is ________ × 10^3 A/m. (Given the value of Bohr magneton μ_B = 9.21 × 10^{-21} Am^2)

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13

2016 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2016

A solid material is found to have a temperature independent magnetic susceptibility, \( \chi = C \). Which of the following statements is correct?

A

If \(C \) is positive, the material is a diamagnet.

B

If \(C \) is positive, the material is a ferromagnet.

C

If \(C \) is negative, the material could be a type I superconductor.

D

If \(C \) is positive, the material could be a type I superconductor.

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14

2018 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2018

The high temperature magnetic susceptibility of solids having ions with magnetic moments can be described by $\chi \propto \frac{1}{T+\theta}$ with $T$ as absolute temperature and $\theta$ as constant. The three behaviors i.e. paramagnetic, ferromagnetic and anti-ferromagnetic are described, respectively, by

A

$\theta < 0, \theta > 0, \theta = 0$

B

$\theta > 0, \theta < 0, \theta = 0$

C

$\theta = 0, \theta < 0, \theta > 0$

D

$\theta = 0, \theta > 0, \theta < 0$

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15

2021 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2021

As shown in the figure, inverse magnetic susceptibility (1/\(\chi\)) is plotted as a function of temperature (\(T\)) for three different materials in paramagnetic states.
(Curie temperature of ferromagnetic material = \(T_C\)
Neel temperature of antiferromagnetic material = \(T_N\))
Choose the correct statement from the following

A

Material 1 is antiferromagnetic (\(T < T_N\)), 2 is paramagnetic, and 3 is ferromagnetic (\(T < T_C\)).

B

Material 1 is paramagnetic, 2 is antiferromagnetic (\(T < T_N\)), and 3 is ferromagnetic (\(T < T_C\)).

C

Material 1 ferromagnetic (\(T < T_C\)), 2 is antiferromagnetic (\(T < T_N\)), and 3 is paramagnetic.

D

Material 1 is ferromagnetic (\(T < T_C\)), 2 is paramagnetic, and 3 is antiferromagnetic (\(T < T_N\)).

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16

2022 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2022

Potassium metal has electron concentration of \( 1.4 \times 10^{28} \, \text{m}^{-3} \) and the corresponding density of states at Fermi level is \( 6.2 \times 10^{46} \, \text{Joule}^{-1} \, \text{m}^{-3} \). If the Pauli paramagnetic susceptibility of Potassium is \( n \times 10^{-6} \) in standard scientific form, then the value of \( k \) (an integer) is ______________. (Magnetic moment of electron is \( 9.3 \times 10^{-24} \, \text{Joule T}^{-1} \); permeability of free space is \( 4\pi \times 10^{-7} \, \text{T m A}^{-1} \))

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17

2024 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2024

The temperature \(T\) dependence of magnetic susceptibility \(\chi\) (Column I) of certain magnetic materials (Column II) are given below. Which of the following option is/are correct?

Column I	Column II
(1)	(P) Diamagnetic
(2)	(Q) Paramagnetic
(3)	(R) Ferromagnetic
(4)	(S) Antiferromagnetic

A

2 – P, 4 – Q, 3 – S

B

4 – P, 1 – Q, 2 – R

C

4 – Q, 2 – R, 1 – S

D

3 – P, 4 – Q, 2 – R

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18

2023 · Physics · Solid State Physics · Dielectric and Magnetic Properties

Physics (PH) 2023

The figure schematically shows the \(M\) (magnetization) - \(H\) (magnetic field) plots for certain types of materials. Here \(M\) and \(H\) are plotted in the same scale and units. Which one of the following is the most appropriate combination?

A

(Q) - Paramagnet; (R) - Type-I Superconductor; (S) - Antiferromagnet

B

(P) - Paramagnet; (Q) - Diamagnet; (R) - Type-I Superconductor

C

(P) - Paramagnet; (Q) - Antiferromagnet; (R) - Type-I Superconductor

D

(P) - Diamagnet; (R) - Paramagnet; (S) - Type-I Superconductor

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