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
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:
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 |
68%
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 |
65%
Level 2: 60%+
Hints
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 |
73%
Level 2: 60%+
Hints
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 |
79%
Level 2: 60%+
Hints
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 | ||
| \(\mathrm{(A)}\) | Paramagnetic material | \(\mathrm{(I)}\) | \(\mu_r<1\) |
| \(\mathrm{(B)}\) | Diamagnetic material | \(\mathrm{(II)}\) | \(\mu_r>1\) |
| \(\mathrm{(C)}\) | Ferromagnetic material, with domains orienting in the same direction | \(\mathrm{(III)}\) | \(\mu_r\gg1\) |
| \(\mathrm{(D)}\) | An equimolar mixture of two substances: one paramagnetic & the other diamagnetic | \(\mathrm{(IV)}\) | \(\mu_r=0\) |
| 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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