Humanity is facing a very long time to magnetism and electromagnetism. But the study of these phenomena thoroughly, until the end people could not, because all experiments ever conducted on the ground, were held without fields of the Earth. It was argued that the effect of field of the Earth "… very little, and we ignore it …." That is only true if this assertion, if the value is discarded, which was not measured and do not understand? Let's hypothetically an experiment where the effects of extraneous fields do not affect the course of this experiment: take two identical circuit and pass through one of them current. Contour within which the current passes, will create his field, spreading it in space until it reaches the second circuit. Ie the second circuit will respond to the field created by the first circuit (different in magnitude but opposite in direction). Thus, there are two objects with equal but opposite to the location of the poles.
Do not forget that these two circuits is not affected by other fields except the fields produced by them. And in this case they will be attracted. Phenomenon resonance observed in terrestrial conditions, these circuits did not appear. But it emerged the phenomenon of magnetic attraction – and under the influence of this force were fixed objects to each other. Magnetic field have all the items in Universe – the planets, stars, to microscopic particles (atoms). Magnetic field is the ability of subjects to influence one another by pulling or pushing away.