Question

Can anyone explain about earth magnetism with hand made diagram

Answer 1

To a first approximation the magnetic field observed at the surface of Earth is like that of a magnet aligned with the planet's rotation axis. ... Then, as shown in the diagram, magnetic field lines leave the north pole of the magnet and curve around until they cross Earth's Equator pointing geographically northward.

Answer 2

Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with the magnetic field S pole near the Earth's geographic north pole (see Magnetic North Pole) and the other magnetic field N pole near the Earth's geographic south pole (see Magnetic South Pole). This makes the compass usable for navigation. The cause of the field can be explained by dynamo theory. A magnetic field extends infinitely, though it weakens with distance from its source. The Earth's magnetic field, also called the geomagnetic field, which effectively extends several tens of thousands of kilometres into space, forms the Earth's magnetosphere. A paleomagnetic study of Australian red dacite and pillow basalt has estimated the magnetic field to be at least 3.5 billion years old.

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