(Refer to figure 105) If the magnetic heading shown for aircraft 8 is maintained, which ADF illustration would indicate the aircraft is on the 090 magnetic bearing FROM the station Definition 6 At MagneticLocks.net we sell Indoor Magnetic Locks, Outdoor Magnetic Locks, Single & Double Door Magnetic Locks, Gate Magnetic Locks, Electric Door Holders, Electric Strikes, Electric Deadbolts and Access Control Products. The earth's magnetic field looks very much the same, although it is much larger. Assessment. After students have thoroughly discussed the activities in the student sheet, refer students to Magnetic Fields. Instruct students to read this article and use what they have read to explain what happened in the activity. Magnetic field strength is given the symbol H with the unit Tesla. Magnetic flux density is given the symbol B and has the unit (W m-2) To measure the magnetic field caused by a current the Biot Savart law is used. The magnetic field is a vector field which means that it has a magnitude and direction for each point in space. "On the other hand, if you had a map of an area, you might not have to go to all that trouble! Very often maps show magnetic as well as true north, and give the declination numerically! The magnetic declination for the area shown on the map on the right was about 13 ° W in June, 2000! Do you recognize this place, Lou?" A magnet is an object made of certain materials which create a magnetic field. Every magnet has at least one north pole and one south pole. By convention, we say that the magnetic field lines leave the North end of a magnet and enter the South end of a magnet. This is an example of a magnetic dipole ("di" means two, thus two poles).