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Q. No.Two identical bar magnets are kept as shown in the figure. The direction of the resultant magnetic field, indicated by the arrowhead at the point \(\mathrm{P}\) is:
1.
2.
3.
4.
Subtopic: Magnetic Field & Field Lines |
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A magnet of magnetic dipole moment \(10\hat{i}\) A-m2 is placed along the x-axis in a magnetic field \(\vec B=(\widehat i+2\widehat j)\) T. The torque acting on the magnet is:
1. \((30\widehat k)\) N-m
2. \((10\widehat i+20\widehat j)\) N-m
3. \((20\widehat k)\) N-m
4. \((-30\widehat k)\) N-m
1. \((30\widehat k)\) N-m
2. \((10\widehat i+20\widehat j)\) N-m
3. \((20\widehat k)\) N-m
4. \((-30\widehat k)\) N-m
Subtopic: Magnetic Field & Field Lines |
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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. \( 2 \pi \sqrt{\frac{1}{m B}}\)
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. \( 2 \pi \sqrt{\frac{1}{m B}}\)
4. \(2 \pi \sqrt{\frac{m}{2 / B}}\)
Subtopic: Analogy between Electrostatics & Magnetostatics |
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Subtopic: Magnetic Field & Field Lines |
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Subtopic: Magnetization & Magnetic Intensity |
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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 |
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There are two materials \(A\) and \(B\). The material \(B\) have high coercivity and \(A\) have low coercivity. The hysteresis loop area of material \(A\) is lesser than the material \(B\). Then:
| 1. | material \(A\) is preferred for making electromagnets. |
| 2. | material \(B\) is preferred for making permanent magnets. |
| 3. | material \(A\) is preferred for using electric generators and transformers. |
| 4. | all of these. |
Subtopic: Magnetization & Magnetic Intensity |
82%
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A \(100\)-turn coil of wire of size \(2~\mathrm{cm}\times 1.5~\mathrm{cm}\) is suspended between the poles of a magnet producing a field of \(1\) T, inside a galvanometer. Calculate the torque on the coil due to a current of \(0.1~\mathrm{A}\) passing through the coil.
1. \(3 \times 10^{-5}\) N-m
2. \(30\) N-m
3. \(3 \times 10^{-3}\) N-m
4. \(3 \times 10^{-2}\) N-m
1. \(3 \times 10^{-5}\) N-m
2. \(30\) N-m
3. \(3 \times 10^{-3}\) N-m
4. \(3 \times 10^{-2}\) N-m
Subtopic: Bar Magnet |
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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. \(\frac{2}{\mu_0}\left(B_eR^3\right )\)
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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