Earth's gravitational field size.

[tentimes10]

Is the size of Earth's gravitational field the same size as it's electric/magnetic field?

Also, what is the standard theory as to why the Earth has a magnetic field? What I mean is, how is it generated? Is it the result of the Earth traveling through space and interacting with the rays etc. of the Sun? Or, does the Earth generate the magnetic field itself - almost as a planetary dynamo due to plate tectonics and the motion/composition of it's core?


Thanks!

 

[Vorde]

Technically, a gravitational field extends outwards infinitely, so the word size does not have much use. You could easily calculate a bodies effective gravitational field (i.e. how far does its gravitational field extend where it is the primary force on objects within it), but this would require a stronger definition of the 'effective' field.

As for the magnetic field, I'm not quite sure but I believe its thought to be related to the movement of heavy metals in the Earth's Core, but someone correct me if they know more.

 

[Drakkith]

The magnetic field is usually explained via the Dynamo effect occurring within the Earth.

The Earth's gravitational field extends infinitely in range. However it falls off in strength very quickly, so past a certain range you can ignore it for all but the utmost precise calculations.

 

[Drakkith]

For comparison, the Earth's gravity accelerates you and I at about 9.8 m/s/s. The moon, distance of about 384,000 km from the Earth is accelerated at about 0.00267 m/s/s.

 

[pmacias]

The size of Earth's gravitational field is not the same as its electric/magnetic field. The gravitational field is determined by the mass and density of the Earth, while the electric/magnetic field is determined by the movement of charged particles within the Earth's core.

The standard theory for the Earth's magnetic field is that it is generated by a process called the dynamo effect. This is when the Earth's rotation and convection in the liquid outer core create electric currents, which in turn generate the magnetic field. This process is aided by the Earth's solid inner core, which acts as a seed for the magnetic field and helps maintain its strength.

While the Sun's radiation and solar wind do interact with the Earth's magnetic field, they are not the primary source of its generation. The Earth's magnetic field is primarily a result of its internal processes, rather than external influences. However, these external influences can cause fluctuations and changes in the Earth's magnetic field over time.