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Q. No.Which of the following is the correct representation of magnetic field lines?
1.
(g), (c)
2.
(d), (f)
3.
(a), (b)
4.
(c), (e)
Subtopic: Magnetic Field & Field Lines |
88%
Level 1: 80%+
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Which one of the following is correct?
| 1. | The magnetic field lines also represent the lines of force on a moving charged particle at every point. |
| 2. | The magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. |
| 3. | A bar magnet exerts a torque on itself due to its own field. |
| 4. | The magnetic field arises due to stationary charges. |
Subtopic: Magnetic Field & Field Lines |
52%
Level 3: 35%-60%
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Diamagnetic material in a magnetic field moves:
| 1. | from stronger to the weaker parts of the field |
| 2. | from weaker to the stronger parts of the field |
| 3. | perpendicular to the field |
| 4. | in none of the above directions |
Subtopic: Magnetic Materials |
83%
Level 1: 80%+
AIPMT - 2003
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If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by \(\mu_d,~\mu_p,~\text{and}~\mu_f\) respectively, then:
1. \(\mu_p= 0 ~\text{and}~\mu_f \ne0\)
2. \(\mu_d\neq 0 ~\text{and}~\mu_p=0\)
3. \(\mu_d\ne 0 ~\text{and}~\mu_f \ne0\)
4. \(\mu_d= 0 ~\text{and}~\mu_p \ne0\)
Subtopic: Magnetic Materials |
80%
Level 1: 80%+
AIPMT - 2005
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For protecting a magnetic needle, it should be placed:
| 1. | In an iron box. |
| 2. | In a wooden box. |
| 3. | In a metallic box. |
| 4. | None of these. |
Subtopic: Magnetic Materials |
Level 3: 35%-60%
AIPMT - 1998
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Subtopic: Magnetic Field & Field Lines |
92%
Level 1: 80%+
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A \(100\)-turn coil of wire of size \(2~\text{cm}\times 1.5~\text{cm}\) is suspended between the poles of a magnet producing a field of \(1~\text T,\) inside a galvanometer. Calculate the torque on the coil due to a current of \(0.1~\text{A}\) 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 |
81%
Level 1: 80%+
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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%
Level 1: 80%+
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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 \(P\) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Magnetic Field & Field Lines |
55%
Level 3: 35%-60%
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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 \(R\))
(Mass of coil is \(m\), radius is \(R\))
| 1. | \(2 \pi \sqrt{\dfrac{m}{I B}} \) | 2. | \( \sqrt{\dfrac{2 \pi m}{I B}} \) |
| 3. | \( 2 \pi \sqrt{\dfrac{I}{m B}}\) | 4. | \(2 \pi \sqrt{\dfrac{m}{2 / B}}\) |
Subtopic: Analogy between Electrostatics & Magnetostatics |
Level 3: 35%-60%
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