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Q. No.A piece of soft iron is placed within the coils of a solenoid, the current through the solenoid being sufficiently large so that the iron is completely magnetised. If the current is increased further the magnetic field within the iron will:
| 1. | remain constant |
| 2. | increase slightly |
| 3. | increase proportionately with the current |
| 4. | decrease |
Subtopic: Magnetization & Magnetic Intensity |
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A regular array of identical vertical current-carrying wires, each passing through a horizontal table, is arranged as shown in the figure (with the direction of current flow indicated). Where are diamagnetic particles most likely to accumulate if they are scattered on the table?
| 1. | Around regions such as \(A.\) |
| 2. | Around regions such as \(B.\) |
| 3. | In circular regions around individual wires such as \(C.\) |
| 4. | Uniformly everywhere. |
Subtopic: Magnetic Materials |
From NCERT
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Two materials \(A-a\) paramagnetic substance, and \(B-a\) diamagnetic substance are mixed together in equal amounts (equimolar) and made into a solid. They do not react or interact otherwise with each other. The mixture is expected to be:
1. Paramagnetic
2. Diamagnetic
3. Ferromagnetic
4. Non-magnetic
1. Paramagnetic
2. Diamagnetic
3. Ferromagnetic
4. Non-magnetic
Subtopic: Magnetic Materials |
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Two short identical bar-magnets are placed on the \(x\)-axis at \(x=+1\) and \(x=-1,\) with their magnetic axes along the \(+x\) direction. As one moves along the \(y\)-axis,
| 1. | the \(y\)-component of the magnetic field \(=0\) |
| 2. | the \(x\)-component of the magnetic field \(=0\) |
| 3. | the \(x\)-component of the magnetic field is zero, only at the origin. |
| 4. | the \(y\)-component of the magnetic field is zero, only at the origin. |
Subtopic: Magnetic Field & Field Lines |
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When a bar magnet is rotated from its position parallel to the external magnetic field \(B=10^{-3}\) T to a direction opposite to the field (anti-parallel), the work done is \(3\) J.
Then, the maximum torque experienced by this magnet in this field is:
1. \(3\times10^{-3}\) N-m
2. \(3\times10^{3}\) N-m
3. \(6\) N-m
4. \(1.5\) N-m
Subtopic: Bar Magnet |
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A current-carrying loop is placed in magnetic field as shown in figure. What is the time period of small oscillation about an axis passing through diameter of the coil?
(Mass of coil is \(m\), radius is \(R\))
1. \(2 \pi \sqrt{\frac{m}{I B}}\)
2. \( \sqrt{\frac{2 \pi m}{I B}}\)
3. \( 2 \pi \sqrt{\frac{I}{m B}}\)
4. \(2 \pi \sqrt{\frac{m}{2 / B}}\)
(Mass of coil is \(m\), radius is \(R\))
1. \(2 \pi \sqrt{\frac{m}{I B}}\)
2. \( \sqrt{\frac{2 \pi m}{I B}}\)
3. \( 2 \pi \sqrt{\frac{I}{m B}}\)
4. \(2 \pi \sqrt{\frac{m}{2 / B}}\)
Subtopic: Analogy between Electrostatics & Magnetostatics |
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Given below are two statements:
| Statement I: | The self-inductance of a solenoid is increased greatly when a ferromagnetic material is inserted into the core. |
| Statement II: | The inductance of solenoid becomes negative when a diamagnetic substance is introduced into its core. |
| 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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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 |
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A paramagnetic substance is placed within the field of a solenoid and the current passing through the coils is doubled. The magnetic field within the substance:
| 1. | will double |
| 2. | will remain constant |
| 3. | will increase but only slightly |
| 4. | will decrease slightly |
Subtopic: Magnetic Materials |
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In which of the following situations is the interaction energy of two short bar magnets higher? The magnets are identical and held at the same separation.
| 1. | \(A\) |
| 2. | \(B\) |
| 3. | neither \(A\) nor \(B,\) since both have same energy |
| 4. | the two situations can't be compared as one is repulsive, the other attractive |
Subtopic: Bar Magnet |
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