Is magnetic field different from gravitaional field? Please explain.?
141095
A magnetic field has a north and south polarity. Gravitation is mostly the same every where on Earth.
590620
The difference lies in the nature of the fields. The electric fields can affect every charged particle whether it is static or moving but magnetic field can affect it only if its moving that even not along the magnetic field lines. The force due to electric field follows F=qE and is in the direction of the field itself whereas the magnetic force follows F=q(vxB) and is in the perpendicular direction to the magnetic field and thus causes the charge particle to gyrate around the field lines. Moreover the work done by a magnetic force is zero unlike in the case of an electric force.
229163
In physics, a magnetic field is an entity produced by moving electric charges (electric currents) that exerts a force on other moving charges. (The quantum-mechanical spin of a particle produces magnetic fields and is acted on by them as though it were a current; this accounts for the fields produced by "permanent" ferromagnets.) A magnetic field is a vector field: it associates with every point in space a (pseudo-)vector that may vary in time. The direction of the field is the equilibrium direction of a compass needle placed in the field.
108424
Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with one pole near the geographic north pole and the other near the geographic 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 is probably explained by dynamo theory. The magnetic field extends several tens of thousands of kilometres into space as the magnetosphere\n\nThe locations of the magnetic poles are not static but wander as much as 15km every year (Dr. David P. Stern, emeritus Goddard Space Flight Center, NASA). The two poles wander independently of each other and are not at directly opposite positions on the globe. Currently the south magnetic pole is farther from the geographic south pole than the north magnetic pole is from the north geographic pole.\n\nThe field is similar to that of a bar magnet, but this similarity is superficial. The magnetic field of a bar magnet, or any other type of permanent magnet, is created by the coordinated motions of electrons (negatively charged particles) within iron atoms. The Earth's core, however, is hotter than 1043 K, the Curie point temperature at which the orientations of electron orbits within iron become randomized. Such randomization tends to cause the substance to lose its magnetic field. Therefore the Earth's magnetic field is caused not by magnetised iron deposits, but mostly by electric currents in the liquid outer core.\n\nAnother feature that distinguishes the Earth magnetically from a bar magnet is its magnetosphere. At large distances from the planet, this dominates the surface magnetic field.\n\nElectric currents induced in the ionosphere also generate magnetic fields. Such a field is always generated near where the atmosphere is closest to the Sun, causing daily alterations which can deflect surface magnetic fields by as much as one degree.\n\nMagnetic field variations\n \nGeomagnetic variations since last reversal.The strength of the field at the Earth's surface ranges from less than 30 microteslas (0.3 gauss) in an area including most of South America and South Africa to over 60 microteslas (0.6 gauss) around the magnetic poles in northern Canada and south of Australia, and in part of Siberia.\n\nMagnetometers detect minute deviations in the Earth's magnetic field caused by iron artefacts, kilns, some types of stone structures, and even ditches and middens in geophysical survey. Using the magnetic instruments adapted from airborne devices developed during World War II to detect submarines, the magnetic variations across the ocean floor have been mapped. The basalt -- the iron-rich, volcanic rock making up the ocean floor -- contains a strongly magnetic mineral (magnetite) and can locally distort compass readings. The distortion was recognized by Icelandic mariners as early as the late 18th century. More important, because the presence of magnetite gives the basalt measurable magnetic properties, these magnetic variations have provided another means to study the deep ocean floor. When newly formed rock cools, such magnetic materials record the Earth's magnetic field.\n\nIn October 2003, the Earth's magnetosphere was hit by a solar flare causing a brief but intense geomagnetic storm, provoking unusual displays of aurorae.\n\nMagnetic field reversals\n\n\n\nMain article: geomagnetic reversal \nBased upon the study of lava formations in Hawaii, it has been deduced that the Earth's magnetic field reverses at intervals, ranging from tens of thousands to many millions of years, with an average interval of approximately 250,000 years. The last such event, called the Brunhes-Matuyama reversal, occurred some 780,000 years ago.\n\nThe mechanism responsible for geomagnetic reversals is not well understood. Some scientists have produced models for the core of the Earth wherein the magnetic field is only quasi-stable and the poles can spontan
227729
The units of a gravitational field are Newtons per kilogram (Force per mass). It shows that the more kiograms an object has, the more force the gravitational field is applied to that object. Also, a gravitational field's strength varies inversely with the square of the distance from the object causing the field. That means the closer an object is in the field, the more stronger the field.\n\nThe same goes for electric fields, except the units are Newtons per Couloumb (Force per charge).
83355
Okay, you know the right hand rule. Good.\nFirst consider the effect of only the e-field: The e-field is pointing in the +x direction. Therefore, the force it exerts on the proton will also be in the +x direction.\nSecond, consider the effect of only the magnetic field: The magnetic field is pointing in the +y direction; therefore, the force it exerts on the proton will be in the -x direction (you use the rule you described to figure this part out). It so happens, that in the first scenario, the force exerted on the proton by the magnetic field exactly balances that exerted by the electric field. Therefore, the movement of the proton is unaffected.\n\nHowever, in the second case, the proton is accelerated through a potential difference of 2V. Therefore, it will be moving faster (think about it: a higher potential difference has greater "potential" to pull the proton.  Also, the equation F = qvB where q is the charge of the proton, v is its velocity, and B is the magnetic field strength, states that the faster the proton is moving, the greater will be the force exerted on it.  So, compared to the first case with only a 1V potential difference, the magnetic field here will exert a greater force on the proton. But, the force exerted by the electric field is unchanged. So, the net force on the proton will be in the -x direction.
486058
No.The magnetosphere is the result of Earth`s magnetic field. It depends directly on the magnetic field. But is not expanding or getting smaller, at least not at a large scale. There are variations, but little ones. The magnetic field is created by Earth`s spinning melted iron core. If the angular speed of the core decreases or increases, then the magnetic field and the magnetosphere will do the same thing. For now, thank`s God, is constant.
136094
In order to move a mass in agravitational field work must be done . If moved against gravitational field , work must be done to overcome the gravitational attraction . If moved in direction of the field work is done by the field  itself .\n So gravitational potential at a point in a gravitational field is defined as the work done in moving a unit mass from inbfinity to that point . We consider infinity to be that point where gravitational field is assumed to be zero .\nLet point mass m be placed at certain point and let a unit mass at another point at distance r from it then we have the gravitational attraction given by GM/Square r towards that point .\nIf the unit mass is moved from first location to another point against the force of attraction the work done against attraction is = Gm/Square rdr \nSo the work done in moving mass from first location to infinity is the integration from r to infinity Gm/squre r dr this integration is Gm/r \nSo work done by the field (attraction) in moving from infinity to point location is -Gm/r . So gravuitational potential V at a distance r from a point mass is given by the relation \n        V=-Gm/r\nThe work evolved in bringing a body from infinity to a point in a gravitational field ( or other body ) is called gravitational potenial energy of the body at that point . So bt defination , we have the work done in bringing a body of mass m from infinity to a point at a distance r ( in this case r is the radius of earth) given by \n              U=-GMm/r  where M is the mass of earth  and negative sign idicates that work has been got from the gravitational force . So the potential at infinity is zero and also the gravitational work done is independent of the actual path connecting the points.\n\nThe existance of magnetic field inside material due passing the electric current produce energy proportional to the square of field and the permeability the details found in the refrences.
991018
No! Earth has a power gravity core not a magnetic gravity core, the magnetic and Iron core is the weight density on spacetime providing gravity as some people including me theorise and include that to our major theories.
1018515
Any two magnetic fields will interact with each other. The same happens with the Earth's magnetic field and a magnet, although the Earths magnetic field density is very weak in comparison to a magnet. \nThe magnet will locally distort the Earths magnetic field, which can be seen by looking at a compass in just the Earth's magnetic field, then looking at the compass when a magnet is brought near.
1178364
Where do people get the idea that the rotation of the earth causes gravity?  There is gravity because every mass in the universe attracts every other mass. Spinning has nothing to do with it. The magnetic poles don't have anything to do with causing gravity either.\n\nDoesn't anyone study science?
511616
First: Gravity is due to mass, while magnetism is due to the movement of an electric charge.  For earth, this is believed to be caused by the movement of ions within the earth, the magma near the core.\n\nSecond: The poles of a magnet were misnamed.  They named the poles of a magnet because of the direction they pointed.  However, once the properties of magnetism were truly understood, it was too late.  So, appropriately, it could be said that near the north pole is the south magnetic pole, but I'm sure most teachers would frown upon that assertion.\n\nOther notes about magnetism on earth: The earth is imperfect.  The magnetic field is not uniform, so there are variations.  Magnetic north is not geographic north in all situations.  The earth is tilted, and we don't really know the flow of the magma that causes the magnetic field all that well.  Not to mention, there is speculation that magnetic north and south may flip at some point in time, but the mechanism of this is lost on me.  It has happened a very long time ago, and is expected to happen again sometime in the future.
572099
The electric field and the magnetic field are perpendicular to each other.  They are also both perpendicular to the direction in which the wave is traveling.  So picture it like this:  If the electromagnetic wave is going East, then the magnetic field would be going South/North, and the Electric Field would be going Up/Down.  \n\nThat's a very simplified illustration, but it's the basic concept.
1167649
Not quite! The direction the water goes down the plug-hole depends on whther you are in the northern or southern hemisphere. It has nothing to do with magnetic fields, but everything to do with the coreolis effect, which is caused by the direction in which the Earth is spinning.
651275
I am not 100% sure what you are asking but electromagnetic force is considerably stronger than gravitational force. Just think a fridge magnet can pick up a paper clip which has the entirety of the earth pulling down on it. So it would probably be easier to attract people with electromagnetics than gravity even though our mass is much greater than our charge
299593
Electric field causes a force on all charges whereas magnetic field only causes a force on moving charges. The Lorentz equation can be used to define both electic field strength E and magnetic field strength B. The equation is:\n\nF = q(E + vxB)\n\nThis is a vector equation: q is the charge and vxB is the vector product of velocity and magnetic flux density.
91154
If there are charges on the sphere, then the moving charges will produce a magnetic field. This is called the Biot-Savart law.