S.I. unit of intensity of magnetization is:

1.	Ampere-metre	2.	Ampere-metre2
3.	Ampere/metre	4.	Ampere/metre2

When the plane of a dip circle is along the magnetic meridian, the period of oscillations of dip needle is T₁. When the plane of dip circle is perpendicular to the magnetic meridian, the period of oscillations is T_2, then T₁/T₂ is (Angle of dip = 30$°$)

1. $\sqrt{2}$

2. 1

3. 2

4. $\frac{1}{\sqrt{2}}$

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

Magnetic permeability is maximum for

1. Diamagnetic substance

2. Paramagnetic substance

3. Ferromagnetic substance

4. Same for all three substances

The area enclosed by hysteresis loop is a measure of :

1. Permeability

2. Susceptibility

3. Retentivity

4. Energy loss per cycle

Line joining places of zero angle of dip on earth surface is called :

1. Isoclinic line

2. Aclinic line

3. Isogonic line

4. Agonic line

When a dip circle is kept at a place, the angle of dip obtained is 45$°$. When the dip circle is rotated about its vertical axis by 90$°$, the angle of dip obtained is 60$°$. The true dip at that place is :

1. cot^-1 $\left(\frac{2}{\sqrt{3}}\right)$

2. cot^-1$\left(\frac{4}{3}\right)$

3. ${\tan }^{-1}\left(\frac{2}{\sqrt{3}}\right)$

4. ${\tan }^{-1}\left(\frac{4}{3}\right)$

The magnetic moment of a bar magnet shown in figure(i) is M.

If a hole is drilled through the magnet as shown in figure(ii), then the new magnetic moment of the magnet will be :

1. Equal to M

2. Less than M

3. More than M

4. Zero

When a substance is kept in a magnetic field, it gets repelled. Which of the following represents its susceptibility?

1. -0.0004

2. 0.0004

3. 1.000

4. -1.000