# 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%
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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 |
73%
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Which of the following is not dimensionless?
(where symbols stand for their usual meanings in magnetism)
1. $$\frac{I}{H}$$
2. $$\frac{B}{\mu_0H}$$
3. $$\mu_r$$
4. $$\frac{\mu_r B}{H}$$

Subtopic:  Magnetization & Magnetic Intensity |
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The magnetic moment of a magnet $$(10 ~\text{cm}\times 4~\text{cm}\times1~\text{cm})$$ is $$4 ~\text{Am}^2$$. Its intensity of magnetisation is:
1. $$10^{3}$$ A/m
2. $$10^{2}$$ A/m
3. $$10^{5}$$ A/m
4. $$10^{4}$$ A/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%
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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 |
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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 $$\dfrac{x}{2}$$ 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%
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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%
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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%
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