A ferromagnetic material is placed in an external magnetic field. The magnetic domains:

1. increase in size
2. decrease in size
3. may increase or decrease in size
4. have no relation with the field

Subtopic:  Magnetic Materials |
 53%
From NCERT
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A long, straight wire carries a current \(i.\) The magnetizing field intensity \(H\) is measured at a point P close to the wire. A long, cylindrical iron rod is brought close to the wire so that the point P is at the centre of the rod. The value of \(H\) at P will:

1. increase many times
2. decrease many times
3. remain almost constant
4. become zero
Subtopic:  Magnetic Materials |
 53%
From NCERT
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The magnetic susceptibility is negative for:

1. paramagnetic materials only
2. diamagnetic materials only
3. ferromagnetic materials only
4. paramagnetic and ferromagnetic materials
Subtopic:  Magnetic Materials |
 87%
From NCERT
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The permanent magnetic moment of the atoms of a material is not zero. The material:

a. must be paramagnetic
b. must be diamagnetic
c. must be ferromagnetic
d. may be paramagnetic
Choose the correct option:
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (d) only
Subtopic:  Magnetic Materials |
From NCERT
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The permanent magnetic moment of the atoms of a material is zero. The material:

a. must be paramagnetic
b. must be diamagnetic
c. must be ferromagnetic
d. may be paramagnetic

Choose the correct option:
1. (a), (b)
2. (b) only
3. (c), (d)
4. (a), (d)

Subtopic:  Magnetic Materials |
 85%
From NCERT
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Which of the following pairs has quantities of the same dimensions?

a. magnetic field \(B\) and magnetizing field intensity \(H\)
b. magnetic field \(B\) and intensity of magnetization \(I\)
c. magnetizing field intensity \(H\) and intensity of magnetization \(I\)
d. longitudinal strain and magnetic susceptibility

Choose the correct option: 
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)

Subtopic:  Magnetization & Magnetic Intensity |
 63%
From NCERT
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Mark out the correct options.

(a) Diamagnetism occurs in all materials.
(b) Diamagnetism results from the partial alignment of permanent magnetic moment.
(c) The magnetizing field intensity H is always zero in free space.
(d) The magnetic field of induced magnetic moment is opposite to the applied field.

Choose the correct option

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (a), (d)

Subtopic:  Magnetic Materials |
 59%
From NCERT
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A paramagnetic material is kept in a magnetic field. The field is increased till the magnetization becomes constant. If the temperature is now decreased, the magnetization:

1. will increase
2. decrease
3. remain constant
4. may increase or decrease
Subtopic:  Magnetic Materials |
From NCERT
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A paramagnetic material is placed in a magnetic field. Consider the following statements:

A: If the magnetic field is increased, the magnetization is increased.
B: If the temperature is increased, the magnetization is increased.

1. Both A and B are true
2. A is true but B is false
3. B is true but A is false
4. Both A and B are false

Subtopic:  Magnetic Materials |
 68%
From NCERT
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To measure the magnetic moment of a bar magnet, one may use

(a) a tangent galvanometer

(b) a deflection galvanometer if the earth’s horizontal field is known

(c) an oscillation magnetometer if the earth’s horizontal field is known

(d) both deflection and oscillation magnetometer if the earth’s horizontal field is not known

Choose the correct option 

1.  (a) , (b) , (c)

2. (b) , (c) , (d)

3. (c) , (d) , (a)

4. (a) , (d) , (b)

Subtopic:  Bar Magnet |
From NCERT

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