Question

Write about magnetic field of earth.

Answer 1

The Earth's magnetic field is similar to that of a bar magnet tilted 11 degrees from the spin axis of the Earth. The problem with that picture is that the Curie temperature of iron is about 770 C . The Earth's core is hotter than that and therefore not magnetic. So how did the Earth get its magnetic field?


Magnetic fields surround electric currents, so we surmise that circulating electic currents in the Earth's molten metalic core are the origin of the magnetic field. A current loop gives a field similar to that of the earth. The magnetic field magnitude measured at the surface of the Earth is about half a Gauss and dips toward the Earth in the northern hemisphere. The magnitude varies over the surface of the Earth in the range 0.3 to 0.6 Gauss.

Answer 2

$\huge{answer}$

Earth itself behaves like a magnet which cause a freely suspended magnet to point always in north south direction. the axis of Earth's magnetic field is inclined at an angle of about 15 degree which is geographical axis. Earth's magnetism is due to magnetic field of effect of current which is flowing in the liquid code at the centre of the earth.


$\huge{hope \: it \: helps}$
$\huge{thanks}$