Two identical short bar magnets, each having magnetic moment M, are placed a distance of 2d apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is

 

(a)  μ04π(2) Md3                (b)  μ04π(3) Md3

(c)  (2μ04π)Md3                 (d) μ04π(5) Md3

 

Subtopic:  Bar Magnet |
 55%
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The basic magnetization curve for a ferromagnetic material is shown in the figure. Then, the value of relative permeability is highest for the point :

 

 

1. P         

2. Q

3. R         

4. S

Subtopic:  Magnetization & Magnetic Intensity |
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A superconductor exhibits perfect:
1. Ferrimagnetism
2. Ferromagnetism
3. Paramagnetism             
4. Diamagnetism

Subtopic:  Magnetic Materials |
 50%
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Among the following properties describing diamagnetism identify  the property that is wrongly stated

1. Diamagnetic material do not have permanent magnetic moment

2. Diamagnetism is explained in terms of electromagnetic induction

3. Diamagnetic materials have a small positive susceptibility

4. The magnetic moment of individual electrons neutralize each other

Subtopic:  Magnetic Materials |
 83%
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If a magnet is suspended at an angle 30o to the magnetic meridian, it makes an angle of 45o with the horizontal. The real dip is

(a)tan-132

(b)tan-13

(c)tan-132

(d)tan-123

Subtopic:  Earth's Magnetism (OLD NCERT) |
 51%
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The true value of angle of dip at a place is 60o, the apparent dip in a plane inclined at an angle of 30o with magnetic meridian is

(1)tan-112

(2)tan-12

(3)tan-123

(4)None of these

Subtopic:  Earth's Magnetism (OLD NCERT) |
 74%
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Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P which gets deflected through an angle θ under the influence of magnets. The ratio of distance d1 and d2 will be:

1. (2 tan θ)1/3

2. (2 tan θ)-1/3

3. (2 cot θ)1/3

4. (2 cot θ)-1/3

Subtopic:  Bar Magnet |
 51%
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Two short magnets of equal dipole moments \(M\) are fastened perpendicularly at their centres (figure). The magnitude of the magnetic field at a distance \(d\) from the centre on the bisector of the right angle is:

1. \(\frac{\mu_{0}}{4 \pi}\frac{M}{d^{3}}\) 2. \(\frac{\mu_{0}}{4 \pi}\frac{M \sqrt{2}}{d^{3}}\)
3. \(\frac{\mu_{0}}{4 \pi}\frac{2 \sqrt{2} M}{d^{3}}\) 4. \(\frac{\mu_{0}}{4 \pi}\frac{2 M}{d^{3}}\)
Subtopic:  Bar Magnet |
 54%
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The variation of magnetic susceptibility (χ) with temperature for a diamagnetic substance is best represented by:

1.    2.
3. 4.
Subtopic:  Magnetic Materials |
 67%
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The variation of magnetic susceptibility (χ) with absolute temperature T for a ferromagnetic material is

Subtopic:  Curie's Law and Hysteresis (OLD NCERT) |
 64%
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