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Q. No.In a uniform magnetic field of \(0.049~\text T\), a magnetic needle performs \(20\) complete oscillations in \(5\) seconds as shown. The moment of inertia of the needle is \(9.8 × 10^{-6} ~\text{kg m}^2\). If the magnitude of magnetic moment of the needle is \(x \times 10^{-5 }~\text {Am}^2;\) then the value of '\(x\)' is:
1. \(128\pi^2\)
2. \(50\pi^2\)
3. \(1280\pi^2\)
4. \(5\pi^2\)
1. \(128\pi^2\)
2. \(50\pi^2\)
3. \(1280\pi^2\)
4. \(5\pi^2\)
Subtopic: Bar Magnet |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch List-I with List-II.
Choose the correct answer from the options given below:
1. \(\text{A-II, B-I, C-III, D-IV}\)
2. \(\text{A-III, B-II, C-I, D-IV}\)
3. \(\text{A-IV, B-III, C-II, D-I}\)
4. \(\text{A-II, B-III, C-IV, D-I}\)
| List-I (Material) |
List-II (Susceptibility (\(\chi\))) |
||
| \(\mathrm{A.}\) | Diamagnetic | \(\mathrm{I.}\) | \(\chi=0\) |
| \(\mathrm{B.}\) | Ferromagnetic | \(\mathrm{II.}\) | \(0>\chi\geq-1\) |
| \(\mathrm{C.}\) | Paramagnetic | \(\mathrm{III.}\) | \(\chi\gg1\) |
| \(\mathrm{D.}\) | Non-magnetic | \(\mathrm{IV.}\) | \(0<\chi<\varepsilon\) (a small positive number) |
1. \(\text{A-II, B-I, C-III, D-IV}\)
2. \(\text{A-III, B-II, C-I, D-IV}\)
3. \(\text{A-IV, B-III, C-II, D-I}\)
4. \(\text{A-II, B-III, C-IV, D-I}\)
Subtopic: Magnetic Materials |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the above diagram, a strong bar magnet is moving towards solenoid-\(2\) from solenoid-\(1\). The direction of induced current in solenoid-\(1\) and that in solenoid-\(2\), respectively, are through the directions:
1. \(BA\) and \(CD\)
2. \(AB\) and \(CD\)
3. \(BA\) and \(DC\)
4. \(AB\) and \(DC\)
1. \(BA\) and \(CD\)
2. \(AB\) and \(CD\)
3. \(BA\) and \(DC\)
4. \(AB\) and \(DC\)
Subtopic: Bar Magnet |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn iron bar of length \(\mathrm L\) has magnetic moment \(\mathrm M.\) It is bent at the middle of its length such that the two arms make an angle \(60^\circ\) with each other. The magnetic moment of this new magnet is:
1. \( \mathrm M \over 2\)
2. \( \mathrm {2 M}\)
3. \(\)\(\frac{\mathrm{M}}{\sqrt{3}}\)
4. \(\mathrm M\)
1. \( \mathrm M \over 2\)
2. \( \mathrm {2 M}\)
3. \(\)\(\frac{\mathrm{M}}{\sqrt{3}}\)
4. \(\mathrm M\)
Subtopic: Bar Magnet |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe length of a magnetized iron bar is \(L\) and its magnetic moment is \(M.\) When this bar is bent to form a semicircle its magnetic moment is:
| 1. | \(M\) | 2. | \(\dfrac{M\pi}{2}\) |
| 3. | \( \dfrac{M}{2\pi}\) | 4. | \(\dfrac{2M}{\pi}\) |
Subtopic: Bar Magnet |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch List-I with List-II
Choose the correct answer from the options given below:
1. A-I, B-II, C-III, D-IV
2. A-IV,B-III, C-II, D-I
3. A-III, B-II, C-I, D-IV
4. A-II, B-III, C-IV, D-I
| List-I (Material) | List-II (Example) | ||
| A. | Diamagnet | I. | Alnico |
| B. | Paramagnet | II. | Copper |
| C. | Soft ferromagnet | III. | Aluminium |
| D. | Hard ferromagnet | IV. | Gadolinium |
Choose the correct answer from the options given below:
1. A-I, B-II, C-III, D-IV
2. A-IV,B-III, C-II, D-I
3. A-III, B-II, C-I, D-IV
4. A-II, B-III, C-IV, D-I
Subtopic: Magnetic Materials |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe best suited curve showing the variations of susceptibility (\(\chi\)) of a paramagnetic material in free space with temperature (\(T\)) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Magnetic Materials |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe magnetic potential energy, when a magnetic bar of magnetic moment \(\overrightarrow{M}\) is placed perpendicular to the magnetic field \(\overrightarrow{B}\) is:
1. \(\frac{-mB}{2}\)
2. zero
3. \(-mB\)
4. \(mB\)
1. \(\frac{-mB}{2}\)
2. zero
3. \(-mB\)
4. \(mB\)
Subtopic: Magnetic Field & Field Lines |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and \(\varepsilon\) is a small positive number) is:
| 1. | \(\mu<\mu_{0}\) | 2. | \(0\leqslant\mu_{\mathrm{r}}<1\) |
| 3. | \(-1\leqslant\chi<0\) | 4. | \(1<\mu_r<1+\varepsilon\) |
Subtopic: Magnetic Materials |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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: Magnetization & Magnetic Intensity |
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