EARTH SCIENCE
MAGNETISM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The magnetic field lines flow from Antarctica to northern Canada.
|
|
|
The magnetic field is created by magnetic rocks on the surface.
|
|
|
The magnetic poles line up exactly with Earth’s geographic poles.
|
|
|
The magnetic field is generated in Earth’s core.
|
|
|
The magnetic field is similar to the magnetic field of a bar magnet.
|
Detailed explanation-1: -Which best describes Earth’s magnetic field lines? Answer: ✔ The field lines go out of Earth near the South Pole, enter Earth in the North Pole, and are not aligned with the geographic poles.
Detailed explanation-2: -All magnetic objects produce invisible lines of force that extend between the poles of the object. Earth is similar to a giant bar magnet with magnetic field lines radiating from the south to the north magnetic pole. Charged particles become trapped on these field lines, forming the Earth’s magnetosphere.
Detailed explanation-3: -Explanation: Magnetic field lines or magnetic lines of force are always closed curves because they propagate from the North pole outside the magnet’s body to the magnet’s body and from the south pole to the north pole inside the magnet’s body, forming a loop-like structure. Hence, the magnetic field lines are closed.
Detailed explanation-4: -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.