The correct direction of the magnetic field in the given figures is shown by:

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
Subtopic:  Magnetic Field & Field Lines |
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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 |
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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 |
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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 \(\text{P}\) is:
      
1.
2.
3.
4.
Subtopic:  Magnetic Field & Field Lines |
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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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The unit of magnetic flux is:
1. Oersted
2. Gauss
3. Tesla
4. Maxwell
Subtopic:  Magnetic Field & Field Lines |
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A bar magnet having a magnetic moment of \(2.0\times10^{5}\) JT–1 is placed along the direction of the uniform magnetic field of magnitude, \(B=14\times10^{-5}\) T. The work done in rotating the magnet slowly through \(60^\circ \) from the direction of the field is:
1. \(14\) J
2. \(8.4\) J
3. \(4\) J
4. \(1.4\) J
Subtopic:  Bar Magnet |
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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 |
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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 
Subtopic:  Bar Magnet |
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