Static Fields:

You have noticed the attraction among opposite poles of magnets and the repulsion among similar poles. Alike effects take place with electrically charged objects. Such forces seem to operate only over small distances under laboratory situations, though this is so as such fields weaken quickly, as the distance among poles rises to less than the smallest intensity we can detect. In hypothesis, the fields extend into space for an indefinite period.

The constant electric current in a wire generates a magnetic field in the region of the wire. The lines of magnetic flux are at right angles to the direction of the current. The existence of a steady voltage difference among two nearby objects generates an electrical field; the lines of electrical flux are parallel to the gradient of the charge differential. Whenever the intensity of a current or voltage changes with time, things get more fascinating.