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Q. No.
Two materials \(A-a\) paramagnetic substance, and \(B-a\) diamagnetic substance are mixed together in equal amounts (equimolar) and made into a solid. They do not react or interact otherwise with each other. The mixture is expected to be:
1. Paramagnetic
2. Diamagnetic
3. Ferromagnetic
4. Non-magnetic
Subtopic:  Magnetic Materials |
Level 3: 35%-60%

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A sample of magnetic material is placed in a magnetic field. As the magnetic field is increased, its magnetisation increases and finally, it becomes constant — even if the field is increased further.
Now, the temperature of the sample is decreased. The magnetisation:
1. increases
2. decreases
3. remains unchanged
4. decreases first and then increases
Subtopic:  Magnetic Materials |
Level 3: 35%-60%

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A paramagnetic substance is placed within the field of a solenoid and the current passing through the coils is doubled. The magnetic field within the substance:
1. will double
2. will remain constant
3. will increase but only slightly
4. will decrease slightly
Subtopic:  Magnetic Materials |
Level 3: 35%-60%

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 A ferromagnetic material consists of domains in which the magnetic moments of the atoms are in the same direction within each domain. However, the domains are randomly oriented. A ferromagnetic material is placed in an external magnetic field. Then, 
1. all the domains grow in size.
2. all the domains shrink in size. 
3. some domains grow in size, others shrink.
4. domains rotate in the magnetic field.
Subtopic:  Magnetic Materials |
Level 3: 35%-60%

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Two small paramagnetic samples are placed in an (otherwise uniform) strong external magnetic field \(B.\) If the two samples are placed with a separation that is along the direction of the external field \(B,\) then, the force exerted by the two samples on each other is:
1. attractive.
2. repulsive.
3. zero.
4. any of the above depending on the external field \(B\) and the sample separation.
Subtopic:  Magnetic Materials |
 56%
Level 3: 35%-60%

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The magnetic field within an iron-cored solenoid (carrying a current) is \(5\times10^{-3}~\text T.\) If a small cavity is made within the solenoid, near the centre, and the region is filled with a diamagnetic substance, the magnetic field within the solenoid will:
1. increase by a small amount
2. decrease by a small amount
3. increase by a large amount
4. decrease by a large amount
Subtopic:  Magnetic Materials |
 67%
Level 2: 60%+

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When a diamagnetic material is placed in a magnetic field, the field strength within the material is:
1. increased
2. decreased
3. unchanged
4. fluctuating with time: first increasing and then decreasing
Subtopic:  Magnetic Materials |
 70%
Level 2: 60%+

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When a paramagnetic substance is introduced between the poles of a strong magnet, the field between the poles:
                                           
1. increases slightly
2. decreases slightly
3. increases by a large factor
4. remains unchanged
Subtopic:  Magnetic Materials |
 71%
Level 2: 60%+

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Given below are two statements:
Statement I: Permeability of a paramagnetic substance decreases when temperature is increased.
Statement II: As temperature increases, random molecular motion increases and molecular magnets become more randomly oriented.
 
1. Statement I is incorrect and Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct and Statement II is incorrect.
Subtopic:  Magnetic Materials |
 78%
Level 2: 60%+

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In Column-I, we mention different types of materials and in Column-II, we indicate their relative permeabilities. Match the correct type of material with the proper permeability.
Column-I Column-II
(A) Paramagnetic material (I) \(\mu_r<1\)
(B) Diamagnetic material (II) \(\mu_r>1\)
(C) Ferromagnetic material, with domains orienting in the same direction (III) \(\mu_r\gg1\)
(D) An equimolar mixture of two substances: one paramagnetic & the other diamagnetic (IV) \(\mu_r=0\)
 
1. \(\mathrm{A\text-III,B\text-II,C\text-I,D\text-IV}\)
2. \(\mathrm{A\text-III,B\text-I,C\text-II,D\text-IV}\)
3. \(\mathrm{A\text-I,B\text-II,C\text-III,D\text-IV}\)
4. \(\mathrm{A\text-II,B\text-I,C\text-III,D\text-II}\)
Subtopic:  Magnetic Materials |
 62%
Level 2: 60%+

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