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Q. No.Assume that the magnetic field of the earth is due to a small magnetic dipole, placed at the centre of the earth (radius: \(R\)). The magnetic field at the equator is \(B_e.\) The dipole moment of the dipole is:
1. \(\frac{\pi}{\mu_0}\left(B_eR^3\right )\)
2. \(\frac{2\pi}{\mu_0}\left(B_eR^3\right )\)
3. \(\frac{4\pi}{\mu_0}\left(B_eR^3\right )\)
4. \(\frac{2}{\mu_0}\left(B_eR^3\right )\)
Subtopic: Bar Magnet |
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Select the correct option based on the statements:
| Statement I: | The magnetic field of a circular loop at very far away point on the axial line varies with distance as like that of a magnetic dipole. |
| Statement II: | The magnetic field due to magnetic dipole varies inversely with the square of the distance from the centre on the axial line. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Analogy between Electrostatics & Magnetostatics |
54%
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NEET - 2022
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Given below are two statements:
| Assertion (A): | Susceptibility is defined as the ratio of intensity of magnetization I to magnetic intensity H. |
| Reason (R): | Greater the value of susceptibility, smaller the value of the intensity of magnetization I. |
| 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. | (A) is false but (R) is true. |
Subtopic: Magnetization & Magnetic Intensity |
84%
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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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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 |
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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 |
55%
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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 |
90%
From NCERT
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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 |
85%
From NCERT
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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 |
62%
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Needles N1, N2 and N3 are made of ferromagnetic, paramagnetic, and diamagnetic substances respectively. A magnet, when brought close to them, will:
| 1. | attract all three of them |
| 2. | attract N1 and N2 strongly but repel N3 weakly |
| 3. | attract N1 strongly, N2 weakly and repel N3 weakly |
| 4. | attract N1 strongly, but repel N2 and N3 weakly |
Subtopic: Magnetic Materials |
87%
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