Simply speaking a magnetic field is the an ar around a magnet. Magnets space made out of mineral dubbed magnetide (or lodestone) which has the property of attractingiron. Scientists use magnetic ar lines to represent these magnetic fields. The magnetic ar lines the a basic magnet are presented in the picture below.They suggest from the phibìc pole to the southern pole. However, the magnetic ar lines execute not just finish at the pointer of the magnet. They go best through it, so the inside the magnetthe magnetic field points indigenous the south pole come the north pole. Hence the magnetic field lines form a closeup of the door loop and also do not have any ends. Thus the magnetic field in this instance does not have any kind of ends either.This is actually constantly true. Magnetic fields, no matter how complex they are, perform not have any type of ends.

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These magnetic areas are very important because they exert an influence on various other objects. As we stated before, magnets always attract objects made out of iron. In bespeak to see this, placed a magnet near a pond (made out of iron) and also watch together the magnet pulls the nail towards it? an alert that as you move the magnet closer to the pond the attraction betweenthe nail and also the magnet i do not care stronger. If you move the magnet more away native the pond the attraction i do not care weaker till the moment when the nail stops to it is in attractedaltogether. That"s since at some allude the nail gone into the magnetic ar of the magnet and also was attracted toward the magnet by the magnetic force. Us say that themagnetic field exerts a magnetic force on the nail. The strength of this force depends ~ above the distance between the magnet and also the nail.

 Magnetic ar Lines. unequal Poles entice Each Other. choose Poles Repel every Other. >

However, the magnetic fields of one magnet likewise exert a magnetic pressure on various other magnets. Take 2 magnets and place them next to each other. Once unlike poles, i.e. The north and the southern poles of two magnets are placed close to each other, the magnetic ar lines link, causing the magnets to attract each other. If top top the various other hand, the prefer poles, i.e. The north and the phibìc pole (or the south and also the south pole) are placed close to each other, the magnets carry out not link and the magnets repel every other.This is why the needle in a compass constantly points north/south. The magnetic north pole of the earth attracts the magnetic southern pole of the compass needle. Because of this themagnetic southern pole the the compass needle points towards the north pole of the earth. If you location a solid magnet alongside the compass needle, the needle will certainly turn and pointtowards the north pole the the magnet. If you remove the magnet the needle will return to its initial position.

However, you perform not necessarily need a magnet to obtain a magnetic field. Magnetic fields can additionally be produced by moving charges (electrons or positively/negatively chargedatoms). Thus electric currents, which are basically just moving electrons flowing along a wire generate a magnetic field. This was found by the French physicistAndre Marie Ampere (1775-1836). This result can be portrayed by a very straightforward example.

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 Electrical existing generates magnetic field

All you need to perform this experiment is 2 pieces of wire, a battery, a coil the wire and also a compass. Attach the wire and the coil come the battery as shown above. Together soonas you perform this an electric current starts to flow through the wire and the coil. This electric existing generates a magnetic field in the coil as shown in the figure. The magnetic field then makes the needle the the compass turn towards the coil. As quickly as friend disconnect among the wires indigenous the battery the compass needle will return to itsinitial position.