Magnets and magnetic fields 

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  1. Magnets and Magnetic Fields
  2. Erath's Magnetic Filed
  3. The direction of the magnetic field at a given point
  4. Uniform Magnetic Field
  1. Draw magnetic field lines of a bar magnet and horseshoe magnet.
    1. A compass is positioned at each of the following locations near a bar magnet. In which location the compass would point to the right-hand side of the page?

      Magnets and Magnetic Fields
      1. Which of the following diagram best shows the magnetic field lines between the poles of two permanent magnets?

        Magnets and Magnetic Fields
        1. Identify the magnetic poles labeled L and R in the diagram shown.

          Magnets and Magnetic Fields
          1. Which of the following best represents the magnetic field between two magnets?

            Magnets and Magnetic Fields
            1. Two identical bar magnet are placed as shown.

              Magnets and Magnetic Fields

              What is the direction of the magnetic field at point "P"?
              Topic Notes

              In this lesson, we will learn:

              • Magnets and Magnetic Fields
              • Erath’s Magnetic Filed
              • Uniform Magnetic Field


              • Magnets attract objects made of iron such as paper clips and nails
              • Any magnet (bar magnet or horseshoe magnet) has two ends or faces, called “poles”, the strongest magnetic effect.
              • Compass is used for navigation; the needle of the compass is simply a bar magnet which is supported at its center of gravity to rotate freely.
              • The pole that points the geographic north is called the "north pole" and another pole which points towards the geographic south is called the "south pole".
              • Similar poles attract, opposite poles repel.

              • Magnets and Magnetic Fields

              • If you split a magnet, you will not get isolated north and south poles; instead, two new magnets are produced, each with a north and a south pole.
              • Ferromagnetic Materials: a type of material that shows strong magnetic effect such as, cobalt, nickel, gadolinium, and some of their oxides and alloys.
              • Magnetic Filed: the region around the magnets and it represented by magnetic field lines such as;
                1. the direction of the magnetic field is tangent to a field line at any point
                2. the number of lines per unit area is proportional to the strength of the magnetic field.
              • The direction of the magnetic field at a given point: it is defined as the direction that the north pole of a compass needle would point if placed at that point. The N pole of a nearby compass needle points away from the north pole of the magnet and points towards the south pole of the magnet.

              • Magnets and Magnetic Fields

              • Magnetic field lines form closed loops, unlike electric field lines.

                Erath’s Magnetic Filed
              • The Earth acts like a huge magnet; but its magnetic poles are not at the geographic poles, which are on the Earth rotational axis.
              • Since the north pole (N) of the compass needle points north, the Earth's magnetic pole which is in the geographic north is magnetically a south pole.

              • Magnets and Magnetic Fields

              Uniform Magnetic Field
              • The simplest magnetic field is one that is uniform, it does not change in magnitude or direction.
              • The magnetic field between two poles of a magnet is nearly uniform, except at the edges.

              • Magnets and Magnetic Fields