What is the most accepted scientific explanation for the origin of the Earth's magnetic field?

Give the location of magnetic:
$(i)$ north pole
$(ii)$ south pole

At the magnetic north pole of the earth, the value of the horizontal component of the earth's magnetic field and the angle of dip are, respectively:

At some location on Earth,the horizontal component of Earth's magnetic field is $18 \times 10^{-6} \ T$. At this location,a magnetic needle of length $0.12 \ m$ and pole strength $1.8 \ A \ m$ is suspended from its mid-point using a thread. It makes a $45^{\circ}$ angle with the horizontal in equilibrium. To keep this needle horizontal,the vertical force that should be applied at one of its ends is:

Lines which represent places of constant angle of dip are called

At the magnetic poles of the earth,a compass needle will be