properties of magnetic substance questions with solutions

Showing 1–10 of 36 questions

• MCQmediumMagnetism and matterproperties of magnetic substance

  A paramagnetic material generally shows only weak magnetisation even though its atoms possess permanent magnetic dipole moments. The principal reason is:

  Options

  • Option A

    Atomic magnetic moments vanish in a magnetic field

  • Option B

    Thermal agitation tends to randomise the atomic magnetic moments

  • Option C

    Its magnetic susceptibility is always negative

  • Option D

    Orbital motion of every electron stops

  Check answerShow answer

  JEE mainsNeetMagnetic Properties

  Open question & full solution →
• MCQeasyMagnetism and matterproperties of magnetic substance

  A paramagnetic specimen has magnetic susceptibility χₘ=6×10⁻⁴. It is placed in a magnetising field H=2×10⁵ A m⁻¹. Its magnetisation I is:

  Options

  • Option A

    12 A m⁻¹

  • Option B

    120 A m⁻¹

  • Option C

    1.2×10³ A m⁻¹

  • Option D

    3.33×10⁸ A m⁻¹

  Check answerShow answer

  JEE mainsNeetMagnetic Properties

  Open question & full solution →
• MCQdifficultMagnetism and matterproperties of magnetic substance

  A ferromagnetic specimen reaches magnetic saturation at a sufficiently large magnetising field. Further increase in H then produces relatively little additional magnetisation because:

  Options

  • Option A

    All magnetic domains have disappeared

  • Option B

    Nearly all available domain or atomic magnetic moments are already aligned with the field

  • Option C

    The material has become diamagnetic

  • Option D

    The Curie temperature has necessarily been reached

  Check answerShow answer

  JEE AdvancedMagnetic Properties

  Open question & full solution →
• MCQmediumMagnetism and matterproperties of magnetic substance

  A magnetic material obeys Curie-Weiss law χ=C/(T-$T_C).$ What is χ(2$T_C)/χ(3T_C)?$

  Options

  • Option A

    1/2

  • Option B

    1

  • Option C

    2

  • Option D

    3

  Check answerShow answer
  Open question & full solution →
• MCQdifficultMagnetism and matterproperties of magnetic substance

  For the core of a transformer operating under repeated alternating magnetisation, the preferred magnetic material should have:

  Options

  • Option A

    Large coercivity and a large hysteresis-loop area

  • Option B

    Small coercivity, high permeability and a small hysteresis-loop area

  • Option C

    Large retentivity and very large coercivity

  • Option D

    Negative magnetic susceptibility

  Check answerShow answer

  JEE AdvancedMagnetic Properties

  Open question & full solution →
• MCQeasyMagnetism and matterproperties of magnetic substance

  The relationship between magnetic susceptibility χ and magnetic permeability μ is given by (μ₀ is permeability of free space and μᵣ is relative permeability):

  Options

  • Option A

    χ = μᵣ + 1

  • Option B

    χ = μ/μ₀ - 1

  • Option C

    χ = μᵣ/μ₀ + 1

  • Option D

    χ = 1 - μ/μ₀

  Check answerShow answer

  JEE Mains 2025 2 April Morning Shift

  Open question & full solution →
• MCQmediumMagnetism and matterproperties of magnetic substance

  Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

  Consider a ferromagnetic material :

  Assertion (A) : The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains.

  Reason (R) : At high enough temperature, the domain structure of ferromagnetic material disintegrates. Thus, magnetization will disappear at high enough temperature known as Curie temperature.

  In the light of the above statements, choose the correct answer from the options given below :

  Options

  • Option A

    (A) is true but (R) is false

  • Option B

    Both (A) and (R) are true but (R) is not the correct explanation of (A)

  • Option C

    Both (A) and (R) are true and (R) is the correct explanation of (A)

  • Option D

    (A) is false but (R) is true

  Check answerShow answer

  JEE Mains 202623 January Morning Shift

  Open question & full solution →
• MCQdifficultMagnetism and matterproperties of magnetic substance

  Consider the following statements: I. Diamagnetism arises from an induced magnetic moment opposite to the applied field. II. Paramagnetic atoms generally possess permanent magnetic moments, but thermal agitation tends to randomise them. III. Ferromagnetism involves cooperative alignment associated with exchange interaction and magnetic domains. IV. Above the Curie temperature, a ferromagnet generally loses spontaneous ferromagnetic ordering. Which option is correct?

  Options

  • Option A

    I and II only

  • Option B

    II and III only

  • Option C

    I, II and III only

  • Option D

    I, II, III and IV

  Check answerShow answer

  JEE AdvancedMagnetic Properties

  Open question & full solution →
• MCQdifficultMagnetism and matterproperties of magnetic substance

  Above its Curie temperature, a ferromagnetic material approximately obeys the Curie-Weiss law χ=C/(T-$T_C).$ If T₁=2$T_C$ and T₂=4$T_C,$ then χ(T₁)/χ(T₂) is:

  Options

  • Option A

    1/3

  • Option B

    1

  • Option C

    3

  • Option D

    4

  Check answerShow answer

  JEE AdvancedMagnetic Properties

  Open question & full solution →
• MCQeasyMagnetism and matterproperties of magnetic substance

  A current-carrying solenoid is filled with magnesium having magnetic susceptibility χ = 1.2×10⁻⁵. The percentage increase in the magnetic field is:

  Options

  • Option A

    (6/5)×10⁻³ %

  • Option B

    (5/6)×10⁻⁵ %

  • Option C

    (5/6)×10⁻⁴ %

  • Option D

    (5/3)×10⁻⁵ %

  Check answerShow answer

  JEE Mains 2025 7 April Morning Shift

  Open question & full solution →