Anonymous
Anonymous asked in Science & MathematicsPhysics · 1 decade ago

# Whats The Difference Between Earth's Magnetic Field And Gravity?

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• 1 decade ago

Earth's gravity, denoted by g, refers to the acceleration that the Earth imparts to objects on or near its surface. In SI units this acceleration is measured in m/s² (metres per second per second, equivalently written as m·s−2 or N/kg). It has an approximate value of 9.8 m/s², which means that, ignoring air resistance, the speed of an object falling freely near the Earth's surface increases by about 9.8 metres per second every second. This quantity is informally known as "little g" (contrasted with G, the gravitational constant, known as "big G").

There is a direct relationship between gravitational acceleration and the downwards weight force experienced by objects on Earth (see Conversion between weight and mass). However, other factors such as the rotation of the Earth also contribute to the net acceleration and are usually considered part of Earth's gravity.

The precise strength of the Earth's gravity varies depending on location. The nominal "average" value at the Earth's surface, known as standard gravity is, by definition, 9.80665 m/s² (32.1740 ft/s²). This quantity is denoted variously as gn, ge (though this sometimes means the normal equatorial value on Earth, 9.78033 m/s²), g0, gee, or simply g (which is also used for the variable local value). The symbol g should not be confused with g, the abbreviation for gram (which is not italicized).

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). An imaginary line joining the magnetic poles would be inclined by approximately 11.3° from the planet's axis of rotation. The cause of the field can be explained by dynamo theory.

Magnetic fields extend infinitely, though they are weaker further from their source. The Earth's magnetic field, which effectively extends several tens of thousands of kilometres into space, is called the magnetosphere.

Source(s): wikedpedia
• Anonymous
5 years ago

There is a massive difference. Earth's magnetic field is created by its' northern and southern poles whilst its' gravity comes from it's mass. Gravity and a Magnetic Field are also 2 completely different fields that act in completely different ways, a simple example is that whilst gravity is always attracting an object towards Earths' core, a magnetic field may repel an equally-charge particle to the pole that it is trying to reach. What's more, where Gravity enacts upon things with a mass, a Magnetic Field will only have an effect on a magnet or charged particle.

• Anonymous

Only a limited number of substances respond to a magnetic field, ferrous metals having the strongest attraction.

Whereas a vastly greater variety of materials respond to gravity, even light itself.

Potter's answer is quite good, and correct as well.

Neither gravity nor magnetism are fully understood. Naturally measurements can be made and tests performed in order to quantify and specify their parameters, and (of course) we use both in a variety of ways every day, but selectively negating or reversing the force of either is still elusive.

• 1 decade ago

Gravity is always directed towards the center of the Earth while magnetic field is directed from North pole to South pole.

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• Anonymous

That's like asking what's the difference between a lump of metal and a dream.

it means nothing.

Only similarity is that both are forces.

Grampa John

• 1 decade ago

They involve two different fundamental forces in the Universe - electromagnetism and gravitation. Electromagnetism is caused by electrically charged particles, and influences them. Gravitation is caused by matter and attracts all matter to each other. Electromagnetism is the reason the compass points north, and gravitation is the reason you stay on the ground and don't float away into space.

Feel free to read through these links:

http://en.wikipedia.org/wiki/Earth%27s_magnetic_fi...

http://en.wikipedia.org/wiki/Gravitation

• Anonymous