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Q. No.Which one of the following statement is not correct about the magnetic field ?
| 1. | Inside the magnet, the lines go from the north pole to the south pole of the magnet |
| 2. | Tangents to the magnetic lines give the direction of the magnetic field |
| 3. | The magnetic lines form a closed loop |
| 4. | Magnetic lines of force do not cut each other |
Subtopic: Magnetic Field & Field Lines |
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The figure illustrates magnetic field lines generated by a magnet. Three points \(F,G,\) and \(H\) are marked in the magnetic field. Based on the pattern of field lines shown in the figure, what is the correct relationship among the magnetic field strengths \(B_F, B_G\) and \(B_H\) at these three points?
| 1. | \(B_F>B_G>B_H\) | 2. | \(B_F<B_G<B_H\) |
| 3. | \(B_F=B_H<B_G\) | 4. | \(B_F=B_H>B_G\) |
Subtopic: Magnetic Field & Field Lines |
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Magnetic lines of force due to a bar magnet do not intersect because
| 1. | a point always has a single net magnetic field |
| 2. | the lines have similar charges and so repel each other |
| 3. | the lines always diverge from a single force |
| 4. | the lines need magnetic lenses to be made to interest |
Subtopic: Magnetic Field & Field Lines |
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Maxwell is a unit of:
| 1. | magnetic susceptibility. | 2. | magnetic flux. |
| 3. | magnetic permeability. | 4. | magnetic dipole moment. |
Subtopic: Magnetic Field & Field Lines |
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Subtopic: Magnetic Field & Field Lines |
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Level 2: 60%+
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Given below are two statements:
| Statement I: | The magnetic field of a short bar magnet points from the south-pole to the north-pole within the bar magnet. |
| Statement II: | Bar magnets are made of ferromagnetic materials, and the magnetic field within is much stronger than that outside. |
| 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 Field & Field Lines |
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Level 2: 60%+
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Four small identical bar magnets, each of magnetic dipole moment \(M\), are placed on the vertices of a square of side \(a\) such that the diagonals of the square coincide with the perpendicular bisectors of the respective magnets. The net magnetic field at the centre of the square is:
1. zero
2. \(\dfrac{\mu_{0}}{\sqrt{2 \pi}} \dfrac{M}{a^{3}}\)
3. \(\dfrac{2 \sqrt{2} \mu_{0}}{\pi} \cdot \dfrac{M}{a^{3}}\)
4. \(\dfrac{\mu_{0}}{\pi} \cdot \dfrac{M}{a^{3}}\)
Subtopic: Bar Magnet |
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A bar magnet is demagnetised by placing it inside a solenoid of length \(0.2~\text{m},\) having \(100\) turns, and carrying a current of \(5.2~\text{A}.\) What is the coercivity of the bar magnet?
| 1. | \(285~\text{A/m}\) | 2. | \(2600~\text{A/m}\) |
| 3. | \(520~\text{A/m}\) | 4. | \(1200~\text{A/m}\) |
Subtopic: Bar Magnet |
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The magnetic lines of force inside a bar magnet:
| 1. | do not exist. |
| 2. | are from the N-pole to the S-pole of the magnet. |
| 3. | are from the S-pole to the N-pole of the magnet. |
| 4. | depend upon the area of the cross-section of the bar magnet |
Subtopic: Bar Magnet |
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The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, \(1.0\times10^{-2}~\text{A m}^{2}~\text{and}~\frac{10^{-6}}{\pi^{2}}~\text{kg m}^{2}.\) If it completes \(10\) oscillations in \(10~\text s,\) the magnitude of the magnetic field is:
1. \(0.4~\text T\)
2. \(4~\text T\)
3. \(0.4~\text{mT}\)
4. \(4~\text{mT}\)
1. \(0.4~\text T\)
2. \(4~\text T\)
3. \(0.4~\text{mT}\)
4. \(4~\text{mT}\)
Subtopic: Bar Magnet |
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NEET - 2024
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