properties of magnetic substance questions with solutions

Showing 1–10 of 39 questions

• MCQeasyMagnetism and matterproperties of magnetic substance

  A substance has magnetic susceptibility χₘ=-2.5×10⁻⁵. Which statement is correct?

  Options

  • Option A

    μᵣ=1.000025 and the substance is paramagnetic

  • Option B

    μᵣ=0.999975 and the substance is diamagnetic

  • Option C

    μᵣ=-2.5×10⁻⁵ and the substance is diamagnetic

  • Option D

    μᵣ=1 and the substance is non-magnetic

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• MCQdifficultMagnetism and matterproperties of magnetic substance

  A paramagnetic substance obeys Curie's law. Its magnetic susceptibility is χ₁ at 27°C. What is its susceptibility at 127°C?

  Options

  • Option A

    3χ₁/4

  • Option B

    4χ₁/3

  • Option C

    27χ₁/127

  • Option D

    χ₁/2

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• 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

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• 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

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• 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

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• MCQeasyMagnetism and matterproperties of magnetic substance

  An unmagnetised piece of a ferromagnetic material may contain many strongly magnetised microscopic domains, yet its net magnetic moment can be nearly zero because:

  Options

  • Option A

    Each domain individually has zero magnetic moment

  • Option B

    Different domains are oriented so that their vector sum is approximately zero

  • Option C

    The material becomes diamagnetic whenever it is unmagnetised

  • Option D

    Electron spins disappear in the absence of an external field

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• 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 %

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• MCQmediumMagnetism and matterproperties of magnetic substance

  A long solenoid produces magnetic field B₀ in vacuum. It is completely filled with a linear magnetic material of susceptibility χₘ=0.25, while the current remains unchanged. Neglect end effects. The new field is:

  Options

  • Option A

    0.75B₀

  • Option B

    B₀

  • Option C

    1.25B₀

  • Option D

    1.50B₀

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• MCQdifficultMagnetism and matterproperties of magnetic substance

  Two linear magnetic materials A and B are placed in the same magnetising field H. Their susceptibilities are χ_A=+4×10⁻⁴ and χ_B=-2×10⁻⁴. The ratio of their magnetisations $I_A/I_B$ is:

  Options

  • Option A

    2

  • Option B

    -2

  • Option C

    -1/2

  • Option D

    1/2

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• MCQeasyMagnetism and matterproperties of magnetic substance

  A diamagnetic substance D and a paramagnetic substance P are separately introduced into the same non-uniform magnetic field. Which statement is correct?

  Options

  • Option A

    Both move toward the stronger-field region

  • Option B

    Both move toward the weaker-field region

  • Option C

    D tends toward the weaker-field region whereas P tends toward the stronger-field region

  • Option D

    D tends toward the stronger-field region whereas P tends toward the weaker-field region

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