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 |
 85%
From NCERT
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The material which is used to make permanent magnet has:

1. High retentivity, low coercivity
2. Low retentivity, low coercivity
3. Low retentivity, high coercivity
4. High retentivity, high coercivity

Subtopic:  Magnetic Materials |
 74%
From NCERT
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Which of the following is not dimensionless?
(where symbols stand for their usual meanings in magnetism)

1. IH

2. Bμ0H

3. μr

4. μrBH

Subtopic:  Magnetization & Magnetic Intensity |
From NCERT
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The magnetic moment of a magnet \((10 ~cm\times 4~cm\times1~cm)\) is \(4 ~Am^2\). Its intensity of magnetisation is:

1. 10A/m

2. 10A/m

3. 10A/m

4. 10A/m

Subtopic:  Magnetization & Magnetic Intensity |
 78%
From NCERT
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S.I. unit of intensity of magnetization is:

1. Ampere-metre 2. Ampere-metre2
3. Ampere/metre 4. Ampere/metre2
Subtopic:  Magnetization & Magnetic Intensity |
 62%
From NCERT
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A ferromagnetic material is placed in an external magnetic field. The magnetic domains:

1. must increase in size.
2. must decrease in size.
3. may increase or decrease in size.
4. disappear.

Subtopic:  Magnetic Materials |
From NCERT
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Due to a small magnet, the intensity at a distance \(x\) in the end-on position is \(9~\text{gauss}\). What will be the intensity at a distance \(\frac{x}{2}\) on equatorial position?
1. \(9~\text{gauss}\)
2. \(4~\text{gauss}\)
3. \(36~\text{gauss}\)
4. \(4.5~\text{gauss}\)

Subtopic:  Bar Magnet |
 74%
From NCERT
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The possible value of magnetic susceptibility of a diamagnetic material can be:

1. -2.45

2. 0.75

3. -0.5

4. 1.67

Subtopic:  Magnetic Materials |
 71%
From NCERT
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The bar magnet \(A\) of magnetic moment \(M_A\) is found to oscillate at a frequency twice that of magnet \(B\) of magnetic moment \(M_B\) and the same moment of inertia when placed in a vibration magnetometer. We may say that:
1. \(M_B=8M_A\)
2. \(M_A= 4M_B\)
3. \(M_A=8M_B\)
4. \(M_A=2M_B\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 85%
From NCERT
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When a magnetic material is subjected to a very small magnetising force \(H,\) the intensity of magnetisation is proportional to:

1. \(\frac{1}{\sqrt{H}} \) 2. \(\sqrt{H} \)
3. \(H \) 4. \(H^2\)
Subtopic:  Magnetization & Magnetic Intensity |
 81%
From NCERT
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