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Q. No.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. \(1.4~\text{J}\)
Subtopic: Bar Magnet |
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The susceptibility of a paramagnetic material is \(99.\) The permeability of the material in Wb/A-m is:
(Permeability of free space, \(\mu_{0}=4\pi \times 10^{-7}\) 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, \(\mu_{0}=4\pi \times 10^{-7}\) 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 |
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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 |
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The coercivity of a small magnet when the ferromagnet gets demagnetised is \(3\times 10^{3}~\text{Am}^{-1}\). The current required to be passed in a solenoid coil of length \(10~\text{cm}\) and the number of turns \(100,\) so that the magnet gets completely demagnetised when placed inside the solenoid is:
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 |
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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 |
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Relation between permeability \(\mu\) and magnetising field \(H\) for a sample of iron is \(\mu=({0.5\over H}+8\times 10^{-4})\) henry per metre, where unit of \(H\) is A/m. What would be the value of \(H\) for which magnetic induction of \(1.0\) Wb/m2 can be produced?
1. \(500\) A/m
2. \(0.625\) A/m
3. \(625\) A/m
4. \(5.25\) A/m
1. \(500\) A/m
2. \(0.625\) A/m
3. \(625\) A/m
4. \(5.25\) A/m
Subtopic: Magnetization & Magnetic Intensity |
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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. |
Subtopic: Magnetic Materials |
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From NCERT
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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. | \(\frac{MB}{F}\) | 2. | \(\frac{BF}{M}\) |
| 3. | \(\frac{MF}{B}\) | 4. | \(\frac{F}{MB}\) |
Subtopic: Bar Magnet |
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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 |
52%
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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 |
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