Using a compass is the easiest way. The needle is going to point to the Magnetic North Pole. That means that the compass needle is ALIGNED with the Magnetic Field Lines of the Earth's magnetic field at your current position.
The compass needle is a small bar magnet balanced on a pin. It swivels freely on this balance point. This is how it can align with the magnetic field of the Earth to show what direction magnetic north is. When you introduce another magnetic field, like from a magnet in close proximity, the needle will align with these local fields since their field strength is stronger than Earth's magnetic field - locally.
Uniform magnetic field depends on the position of its surrounding. A non uniform magnetic field changes its position from one place to another.
If a magnetic compass needle is placed in a magnetic Field , its needle deflects and points in the north and south directions
The compass needle is itself a magnet which is why it always points north according to the earth's magnetic field. If you place a magnet (Whose magnetic power is stronger than the earth's) close to the compass its needle will be attracted t the magnet and not to the North Pole.
when a charged particle is moving with some velocity it produces some magnetic field. If we place that charged particle in presence of external magnetic field it gets affected by that external field.
The rotation of the molten, iron core of the Earth.
In a combined magnetic field, a neutral point is a place where the magnetic field is zero
where is the earths magnectic field the stongest? the strongest place of the magnectic place is right in the middle of shouth pole and north pole
The compass needle is a small bar magnet balanced on a pin. It swivels freely on this balance point. This is how it can align with the magnetic field of the Earth to show what direction magnetic north is. When you introduce another magnetic field, like from a magnet in close proximity, the needle will align with these local fields since their field strength is stronger than Earth's magnetic field - locally.
In a combined magnetic field, a neutral point is a place where the magnetic field is zero
If by "middle", you mean the center of the sphere (inside the core), then yes the magnetic density will be high, there, just as it is inside of a magnet. If you mean at the equator, then that is not the strongest place. If by "bottom", you mean the South Pole, the magnetic field density will be stronger at the poles (north and south) than any other place on the surface of the Earth.
Not very strong in comparison with a typical small "bar magnet" which has a field strength of roughly 100 gauss. Earth's magnetic field strength at the surface is about 0.3 to 0.6 gauss. That's stronger than some planets and weaker than others.
To the magnetic poles, which are offset somewhat from the geographic poles, and slowly change location.
Uniform magnetic field depends on the position of its surrounding. A non uniform magnetic field changes its position from one place to another.
Magnetic anomalies occur where vast deposits of iron ore have caused a local deviation in the Earth's magnetic field.Any place where the Earth's magnetic field is not smooth and uniform.Some are so minor that they can't be detected without a million dollars worth of fancy equipment, some you can detect with a pocket compass.
If the magnetic poles shift that means that the Earth has been affected. If there are other effects that are a result of the magnetic pole shift is a matter of debate (mostly how quickly the shift takes place). If the Earth is without a magnetic field for some time ( I do not know the time frame days weeks years decades or millenia) then some things will be affected as the magnetic field channels charged particles towards the poles and keeps the Van Allen belts in place.
Because the Earth wobbles on its path through the universe, the magnetic South Pole indicates the place on the planet where the geo-magnetic field lines are directed vertically upward.