# Two bar magnets are held together tightly in a vibration magnetometer. When their like poles are together, they make 20 oscillations per minute and when their unlike poles are together, they make 8 oscillations per minute. The ratio of the magnetic dipole moments of two bar magnets is: 1. 29:21 2. 6:15 3. 1:6 4. 25:4

Subtopic:  Analogy between Electrostatics & Magnetostatics |
61%
From NCERT
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The magnetic susceptibility $\chi$ of a diamagnetic material depends on absolute temperature T as:

$1.$ $\chi$ $\propto$  $T$ 
$2.$ $\chi$ $\propto$ $\frac{1}{T}$
$3.$ $\chi$ $\propto$  ${T}^{0}$ 
$4.$ $\chi$ $\propto$ $\frac{1}{\sqrt{T}}$

Subtopic:  Magnetic Materials |
72%
From NCERT
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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 |
73%
From NCERT
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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. $\frac{B}{{\mu }_{0}H}$

3. ${\mu }_{r}$

4. $\frac{{\mu }_{r}B}{H}$

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 |
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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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