The aluminum foil is induced by a magnetic field. Why does it produce the opposite magnetic field?
Because, through the internal armature (internal) induction magnetic field lines, so that the electromagnet and the armature induction is a parallel relationship, so the electromagnet and armature produce the same magnetic field, and electromagnetic induction furnace of aluminum foil and they are opposite field.
This series produced with iron nails, and the contact end is opposite to the magnetic field magnet. The electromagnetic furnace caused by the magnetic field, and the relationship between the magnet nails, so the electromagnetic oven is opposite to the magnetic induction. If it were similar to an electromagnet, the foil would have the same magnetic field
Because the induced magnetic field and the magnetic field belongs to the series, this series is similar as the battery positive and negative, the induced magnetic field is similar to positive and negative is similar to that induced by magnetic field produces the opposite magnetic field by aluminum foil. Such as magnets attract nails, nails through the magnetic field lines are external magnet (external) magnetic field lines,
