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Q. No.
Subtopic: Magnetic Field & Field Lines |
92%
Level 1: 80%+
Hints
A magnet of magnetic dipole moment \(10\hat{i}~\text{A-m}^2\) is placed along the x-axis in a magnetic field \(\vec B=(\hat i+2\hat j)~\text{T}.\) The torque acting on the magnet is:
| 1. | \((30\widehat k)~\text{N-m}\) | 2. | \((10\widehat i+20\widehat j)~\text{N-m}\) |
| 3. | \((20\widehat k)~\text{N-m}\) | 4. | \((-30\widehat k)~\text{N-m}\) |
Subtopic: Magnetic Moment |
87%
Level 1: 80%+
Hints
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 |
87%
Level 1: 80%+
Hints
Links
The magnetic lines of force inside a bar magnet are:
| 1. | from the south to the north pole. |
| 2. | from the north to the south pole. |
| 3. | not present. |
| 4. | intersecting each other. |
Subtopic: Magnetic Field & Field Lines |
86%
Level 1: 80%+
Hints
Links
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%
Hints
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 |
51%
Level 3: 35%-60%
Hints
Links
Subtopic: Magnetic Field & Field Lines |
55%
Level 3: 35%-60%
Hints
A bar magnet having a magnetic moment of \(2.0\times10^{5}~\text{JT}^{-1}\) is placed along the direction of the uniform magnetic field of magnitude, \(B=14\times10^{-5}~\text{T}\). The work done in rotating the magnet slowly through \(60^\circ \) from the direction of the field is:
1. \(14~\text{J}\)
2. \(8.4~\text{J}\)
3. \(4~\text{J}\)
4. \(1.4~\text{J}\)
1. \(14~\text{J}\)
2. \(8.4~\text{J}\)
3. \(4~\text{J}\)
4. \(1.4~\text{J}\)
Subtopic: Bar Magnet |
91%
Level 1: 80%+
JEE
Hints
If a magnetic needle is made to vibrate in uniform field \(H\), then its time period is \(T\). If it vibrates in the field of intensity \(4H\), its time period will be:
| 1. | \(2T\) | 2. | \(\dfrac{T}{2}\) |
| 3. | \(\dfrac{2}{T}\) | 4. | \(T\) |
Subtopic: Bar Magnet |
79%
Level 2: 60%+
Hints
Links
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 |
82%
Level 1: 80%+
Hints
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