A domain in ferromagnetic iron is in the form of a cube of side length \(1\) µm. The maximum possible dipole moment is:
[The molecular mass of iron is \(55\) g/mole and its density is \(7.9\) g/cm3. Assume that each iron atom has a dipole moment of \(9.27\times 10^{-24}\) Am2]

1. \(8.0\times10^{-13}\) Am2
2. \(8.0\times10^{-12}\) Am2
3. \(7.0\times10^{-13}\) Am2
4. \(7.0\times10^{-12}\) Am2

Subtopic:  Magnetic Materials |
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A domain in ferromagnetic iron is in the form of a cube of side length \(1~\mu \text{m}\). The magnetisation of the domain is:
(The molecular mass of iron is \(55~\text{g/mole}\) and its density is \(7.9~\text{g/cm}^3\) . Assume that each iron atom has a dipole moment of \(9.27\times 10^{-24}~\text{Am}^2\))

1. \(9.0 \times 10^5~\text{Am}^{-1}\)
2. \(8.0 \times 10^5~\text{Am}^{-1}\)
3. \(11 \times 10^5~\text{Am}^{-1}\)
4. \(3.0 \times 10^5~\text{Am}^{-1}\)

Subtopic:  Magnetic Materials |
 66%
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A solenoid has a core of material with relative permeability \(400\). The windings of the solenoid are insulated from the core and carry a current of \(2~\text{A}\). If the number of turns is \(1000\) per metre, the magnetization, \(M\) is:
1. \(8\times10^{5}~\text{A/m}\)
2. \(6\times10^{5}~\text{A/m}\)
3. \(6.5\times10^{5}~\text{A/m}\)
4. \(8.9\times10^{5}~\text{A/m}\)

Subtopic:  Magnetization & Magnetic Intensity |
 60%
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A solenoid has a core of material with relative permeability \(400.\) The windings of the solenoid are insulated from the core and carry a current of \(2~\text{A}\). If the number of turns is \(1000\) per metre, the magnetising field \(B\) is:
1. \(10~\text{T}\) 
2. \(1~\text{T}\)
3. \(0.1~\text{T}\)
4. \(2~\text{T}\)

Subtopic:  Magnetization & Magnetic Intensity |
 59%
From NCERT
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A solenoid has a core of material with relative permeability \(400.\) The windings of the solenoid are insulated from the core and carry a current of \(2\) A. If the number of turns is \(1000\) per metre, the magnetic field intensity \(H\) is:
1. \(2\times10^2\) A/m
2. \(2\times10^3\) A/m
3. \(2\) A/m
4. \(20\) A/m

Subtopic:  Magnetization & Magnetic Intensity |
 77%
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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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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 figure shows a small magnetized needle P placed at a point O. The arrow shows the direction of its magnetic moment. The other arrows show different positions (and orientations of the magnetic moment) of another identical magnetized needle Q. Then:


 

1. In PQ1 and PQ2 configuration, the system is not in equilibrium.
2. In PQ3 and PQ6 configuration, the system is unstable.
3. In PQ5 and PQ4 configuration, the system is stable.
4. PQ5 configuration corresponds to the lowest potential energy among all the configurations shown.

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 50%
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The ratio of the magnitudes of the equatorial and axial fields due to a bar magnet of length \(5.0~\text{cm}\) at a distance of \(50~\text{cm}\) from its mid-point is:
(Given, the magnetic moment of the bar magnet is \(0.40~\text{Am}^{2}.\))
1. \(\frac{1}{2}\)
2. \(2\)
3. \(1\)
4. 
\(\frac{3}{2}\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 72%
From NCERT
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A solenoid of cross-sectional area \(2\times 10^{-4}~\mathrm{m^2}\) and \(1000\) turns placed with its axis at \(30^\circ\) with an external field of \(800\) G experiences a torque of \(0.016\) Nm. The current flowing through the solenoid is:
1. \(2~\text{A}\)
2. \(4~\text{A}\)
3. \(1~\text{A}\)
4. 
\(5~\text{A}\)

Subtopic:  Bar Magnet |
 64%
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