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Subtopic: Magnetic Field & Field Lines |
91%
From NCERT
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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 |
85%
From NCERT
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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 |
86%
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The magnetic lines of force inside a bar magnet are:
| 1. | from south to the north pole. |
| 2. | from north to the south pole. |
| 3. | not present. |
| 4. | intersecting each other. |
Subtopic: Magnetic Field & Field Lines |
85%
From NCERT
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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 \(\mathrm{P}\) is:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Magnetic Field & Field Lines |
56%
From NCERT
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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. | 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. | Magnetic field arises due to stationary charges. |
Subtopic: Magnetic Field & Field Lines |
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Subtopic: Magnetic Field & Field Lines |
From NCERT
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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 |
90%
From NCERT
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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. T/2
3. 2/T
4. T
Subtopic: Bar Magnet |
79%
From NCERT
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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 |
81%
From NCERT
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