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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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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 |
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Given below are two statements:
| Assertion (A): | Gauss's law for magnetism states that the net magnetic flux through any closed surface is zero. |
| Reason (R): | The magnetic monopoles do not exist. North and South poles occur in pairs, allowing vanishing net magnetic flux through the surface. |
| 1. | (A) is true but (R) is false. |
| 2. | (A) is false but (R) is true. |
| 3. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
Subtopic: Analogy between Electrostatics & Magnetostatics |
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NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
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%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
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 |
From NCERT
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Two short bar-magnets are placed at large distance from each other, with their axes aligned along the same line but in opposition direction to each other. A null point is formed between them at a distance \(r_1\) from the first magnet and \(r_2\) from the second. If the dipole moments of the magnets are \(P_1\) and \(P_2\), then:
1. \(\dfrac{r_1}{r_2}=\dfrac{P_1}{P_2}\)
2. \(\left(\dfrac{r_1}{r_2}\right)^2=\dfrac{P_1}{P_2} \)
3. \(\left(\dfrac{r_1}{r_2}\right)^3=\dfrac{P_1}{P_2} \)
4. none of the above is true.
1. \(\dfrac{r_1}{r_2}=\dfrac{P_1}{P_2}\)
2. \(\left(\dfrac{r_1}{r_2}\right)^2=\dfrac{P_1}{P_2} \)
3. \(\left(\dfrac{r_1}{r_2}\right)^3=\dfrac{P_1}{P_2} \)
4. none of the above is true.
Subtopic: Bar Magnet |
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A current carrying circular loop of wire is placed in a magnetic field \(B\), which makes an angle \(\theta\) with the normal to the loop. The radius of the loop is \(r\), and the loop carries a current \(i\). The magnetic interaction energy of the current carrying loop is \(E_B\) and the torque on the loop has the magnitude \(\tau_B\).
Which of the following, is independent of \(\theta?\)
1. \(E_B\cdot\tau_B\)
2. \(\frac{E_B}{\tau_B}\)
3. \(E_B^2+\tau_B^2\)
4. \(E_B^2-\tau_B^2\)
Which of the following, is independent of \(\theta?\)
1. \(E_B\cdot\tau_B\)
2. \(\frac{E_B}{\tau_B}\)
3. \(E_B^2+\tau_B^2\)
4. \(E_B^2-\tau_B^2\)
Subtopic: Analogy between Electrostatics & Magnetostatics |
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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 |
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A small permanent magnet is placed 'antiparallel' to a uniform magnetic field \(B.\) A null point is found at a distance \(r,\) on the axis of the magnet. Then, \(r\) is proportional to (nearly):
1. \(B^{-3}\)
2. \(B^{-2}\)
3. \(B^{-1/2}\)
4. \(B^{-1/3}\)
1. \(B^{-3}\)
2. \(B^{-2}\)
3. \(B^{-1/2}\)
4. \(B^{-1/3}\)
Subtopic: Bar Magnet |
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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 |
75%
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NEET - 2013
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