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Q. No.Given below are two statements:
Statement I:
All paramagnetic substances become diamagnetic as their temperature is lowered.
Statement II:
All ferromagnetic substances become paramagnetic when their temperature is lowered.
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.
61%
Level 2: 60%+
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A bar magnet having a magnetic moment of \(2.0\times10^{5}~\text{JT}^{-1}\) is placed along the direction of the uniform magnetic field of magnitude, \(B=14\times10^{-5}~\text{T}\). The work done in rotating the magnet slowly through \(60^\circ \) from the direction of the field is:
1. \(14~\text{J}\)
2. \(8.4~\text{J}\)
3. \(4~\text{J}\)
4. \(1.4~\text{J}\)
1. \(14~\text{J}\)
2. \(8.4~\text{J}\)
3. \(4~\text{J}\)
4. \(1.4~\text{J}\)
Subtopic: Bar Magnet |
91%
Level 1: 80%+
JEE
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The susceptibility of a paramagnetic material is \(99.\) The permeability of the material in \(\text{Wb/A-m}\) is:
(Permeability of free space, \(\mu_{0}=4\pi \times 10^{-7} \text{ Wb/A-m}\))
1. \(4 \pi \times 10^{-7} \)
2. \( 4 \pi \times 10^{-4} \)
3. \( 4 \pi \times 10^{-5} \)
4. \( 4 \pi \times 10^{-6} \)
(Permeability of free space, \(\mu_{0}=4\pi \times 10^{-7} \text{ Wb/A-m}\))
1. \(4 \pi \times 10^{-7} \)
2. \( 4 \pi \times 10^{-4} \)
3. \( 4 \pi \times 10^{-5} \)
4. \( 4 \pi \times 10^{-6} \)
Subtopic: Magnetic Materials |
88%
Level 1: 80%+
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The universal property of all substances is:
| 1. | diamagnetism only |
| 2. | ferromagnetism only |
| 3. | paramagnetism only |
| 4. | both paramagnetism and diamagnetism |
Subtopic: Magnetic Materials |
72%
Level 2: 60%+
Hints
When a small ferromagnetic magnet is fully demagnetized, its coercivity is measured to be \(3\times 10^{3}~\text{Am}^{-1}. \) A solenoid of length \(10~\text{cm},\) consisting of \(100\) turns, is used to achieve this demagnetization. What should be the current flowing through the solenoid to completely demagnetize the magnet when placed inside it?
1. \(6~\text{A}\)
2. \(30~\text{mA}\)
3. \(3~\text{A}\)
4. \(1.5~\text{A}\)
1. \(6~\text{A}\)
2. \(30~\text{mA}\)
3. \(3~\text{A}\)
4. \(1.5~\text{A}\)
Subtopic: Magnetization & Magnetic Intensity |
71%
Level 2: 60%+
Hints
If the work done in turning a magnet of magnetic moment \(M\) by an angle of \(90^\circ\) from magnetic meridian is \(n\) times the corresponding work done to turn it through an angle of \(60^\circ,\) then the value of \(n\) is:
1. \(1\over 2\)
2. \(2\)
3. \(\sqrt 3\over 2\)
4. \(2\over \sqrt 3\)
1. \(1\over 2\)
2. \(2\)
3. \(\sqrt 3\over 2\)
4. \(2\over \sqrt 3\)
Subtopic: Analogy between Electrostatics & Magnetostatics |
74%
Level 2: 60%+
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The relationship between permeability \(\mu\) and the magnetising field \(H\) for a sample of iron is given by \(\mu=\left(\dfrac{0.5}{H}+8\times10^{-4} \right)\text{ henry per metre},\) where \(H\) is measured in \(\text{A/m}.\) What value of \(H\) is required to produce a magnetic induction of \(1.0\text{ Wb/m}^2 \text{?}\)
| 1. | \(500\text{ A/m}\) | 2. | \(0.625\text{ A/m}\) |
| 3. | \(625\text{ A/m}\) | 4. | \(5.25\text{ A/m}\) |
Subtopic: Magnetization & Magnetic Intensity |
67%
Level 2: 60%+
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A bar magnet of the magnetic moment \(M\) is placed at right angles to a magnetic induction \(B.\) If a force \(F\) is experienced by each pole of the magnet, the length of the magnet will be:
| 1. | \(\dfrac{MB}{F}\) | 2. | \(\dfrac{BF}{M}\) |
| 3. | \(\dfrac{MF}{B}\) | 4. | \(\dfrac{F}{MB}\) |
Subtopic: Bar Magnet |
76%
Level 2: 60%+
NEET - 2013
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If a magnetic monopole were to exist, what would be appropriate units of its ‘strength’?
1. \(\text{Wb}/\text{T}\)
2. \(\text{T}/\text{m}^3\)
3. \(\text{C.m}/\text{s}\)
4. \(\text{D}/\text{T}\)
1. \(\text{Wb}/\text{T}\)
2. \(\text{T}/\text{m}^3\)
3. \(\text{C.m}/\text{s}\)
4. \(\text{D}/\text{T}\)
Subtopic: Analogy between Electrostatics & Magnetostatics |
50%
Level 3: 35%-60%
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Given below are two statements:
| Assertion (A): | Magnetic susceptibility is a pure number. |
| Reason (R): | The value of magnetic susceptibility for vacuum is one. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Magnetic Materials |
Level 3: 35%-60%
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