A magnetic needle suspended parallel to a 

magnetic field requires 3 J of work to turn

it through 60°. The torque needed to maintain 

the needle in this position will be

(1) 23J                     

(2) 3 J

(3) 3 J                       

(4) 32 J

Subtopic:  Bar Magnet |
 70%
From NCERT
NEET - 2012
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There are four light-weight-rod samples; A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted:

i. A is feebly repelled 
ii.  B is feebly attracted
iii.  C is strongly attracted
iv. D remains unaffected

Which one of the following is true?

1. C is of a diamagnetic material
2. D is of a ferromagnetic material
3. A is of a non-magnetic material
4. B is of a paramagnetic material

Subtopic:  Magnetic Materials |
 88%
From NCERT
NEET - 2011
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Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure

                           

The force on the charge Q is 

1. zero

2. directed along OP

3. directed along PO

4. directed perpendicular to the plane of the paper

Subtopic:  Bar Magnet |
 63%
From NCERT
NEET - 2010
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If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:

1. repelled by both the poles
2. repelled by the north pole and attracted by the south pole
3. attracted by the north pole and repelled by the south pole
4. attracted by both the poles
Subtopic:  Magnetic Materials |
 85%
From NCERT
NEET - 2009
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A bar magnet having a magnetic moment of 2×104 JT-1 is free to rotate in a horizontal plane. A horizontal magnetic field B=6×10-4T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60° from the field is 

(a) 0.6 J                            (b) 12 J

(c) 6 J                               (d) 2 J

Subtopic:  Analogy between Electrostatics & Magnetostatics | Bar Magnet |
 90%
From NCERT
NEET - 2009
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Curie temperature is the temperature above which -

1. ferromagnetic material becomes paramagnetic material 

2. paramagnetic material becomes diamagnetic material 

3. paramagnetic material becomes ferromagnetic material 

4. ferromagnetic material becomes diamagnetic material  

Subtopic:  Magnetic Materials |
 85%
From NCERT
NEET - 2008
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Domain formation is the necessary feature of : 

(1) ferromagnetism                   (2) diamagnetism

(3) paramagnetism                   (4) all of these

Subtopic:  Magnetic Materials |
 76%
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The magnetic susceptibility of a paramagnetic substance at -73°C is 0.0060, then its value at -173°C will be 

1. 0.0030

2. 0.0120

3. 0.0180

4. 0.0045

Subtopic:  Magnetization & Magnetic Intensity |
 75%
From NCERT
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The magnetic dipoles in a diamagnetic material are represented, for three situations. The three situations differ in magnitude if a magnetic field is applied to the material. In which situation the magnetization of the material is the greatest:
            

1. \(A\) 2. \(B\)
3. \(C\) 4. Equal in \(A,B\) and \(C\)
Subtopic:  Magnetization & Magnetic Intensity |
From NCERT
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An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be 

1. M

2. 2Mπ

3. Mπ

4. 

Subtopic:  Bar Magnet |
 76%
From NCERT
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