Class: Physics II Group 10. Lab performed 10/14/ 2016 Report submitted 10/27/ Eric Thomas. PHYSICS Lab 6: Magnetism

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Class: Physics II Group 10 Lab performed 10/14/ 2016 Report submitted 10/27/2016 All roads that lead to success have to pass through hard work boulevard

1 Class: Physics II Group 10 Lab performed 10/14/ 2016 Report submitted 10/27/2016 All roads that lead to success have to pass through hard work boulevard at some point. -Eric Thomas PHYSICS Lab 6: Magnetism by Darby Sparks, Allison Moss, Crystal Davis Arkansas State University Chemistry & Physics Department 1

Introduction: In this lab the students used various magnets including bar magnets, U-magnets, and a soft iron bar magnet to construct different arrangements to determine

By sprinkling iron filings on this paper, the iron became magnetized and followed the direction of magnetic field.

magnets. Procedure: Before we began our experiment, we tested the compass on one of our magnets, to find that the red tip pointed toward the south pole of the magnet.

We covered it with a sheet of paper, then sprinkled iron fillings onto the paper above the magnet. This allowed us to observe the magnetic field it produced.

2 Introduction: In this lab the students used various magnets including bar magnets, U-magnets, and a soft iron bar magnet to construct different arrangements to determine magnetic fields and forces. For each arrangement, the magnets were placed into the magnetic plotting board with a piece of paper laying on the plane above them. By sprinkling iron filings on this paper, the iron became magnetized and followed the direction of magnetic field. The arrangement of the iron filings resembles magnetic field lines and helps the students have a better understanding of attractive and repulsive forces created by the magnets. Procedure: Before we began our experiment, we tested the compass on one of our magnets, to find that the red tip pointed toward the south pole of the magnet. This red tip will always point in the direction of the magnetic field. We then placed a bar magnet on our magnetic plotting board. We covered it with a sheet of paper, then sprinkled iron fillings onto the paper above the magnet. This allowed us to observe the magnetic field it produced. We repeated this process for each magnet, and different orientations of multiple magnets as seen below. Figure 1 Figure 2 Figure 1 shows the magnetic field around a single bar magnet. The magnetic field points in the direction of the south pole. A sketch of the magnetic field lines can be seen in Figure 2. 2

Figure 3 Figure 4 Figure 3 shows the magnetic field lines of a single U shaped magnet.

The shape of the U magnet causes a different pattern of field lines than the bar magnet.

each other. As you can see, they attract each other.

Figure 7 Figure 8 In Figure 7, you can see the interaction between two like poles.

3 Figure 3 Figure 4 Figure 3 shows the magnetic field lines of a single U shaped magnet. As you can see from our diagram in Figure 4, the field lines still point toward the south pole. The shape of the U magnet causes a different pattern of field lines than the bar magnet. Figure 5 Figure 6 Figure 5 shows the magnetic field of two bar magnets with unlike poles toward each other. As you can see, they attract each other. In Figure 6, you can see the field lines going straight from the north pole to the south pole. Figure 7 Figure 8 In Figure 7, you can see the interaction between two like poles. They repel each other, so unlike before, there are no field lines directly between the south poles of the magnets. Figure 8 shows the direction of the field lines. 3

Figure 9 Figure 10 Figure 9 shows the magnetic field lines of a U shaped magnet and a soft iron bar.

Figure 11 Figure 12 Figure 11 shows two U-shaped magnets with like poles toward each other.

Analysis & Conclusion: There are many ways to construct different magnetic fields and forces using these permanent magnets.

As we observed first-hand in this lab, the opposite poles of the magnets attract and when brought close enough, the magnetic force tend to join the magnets.

4 Figure 9 Figure 10 Figure 9 shows the magnetic field lines of a U shaped magnet and a soft iron bar. The soft iron bar is polarized, and its poles are aligned opposite to the poles of the U shaped magnet. The direction of the field lines can be seen in Figure 10. Figure 11 Figure 12 Figure 11 shows two U-shaped magnets with like poles toward each other. These poles repel each other, causing the field lines to curve away from each other. This can be seen in our diagram in Figure 12. Analysis & Conclusion: There are many ways to construct different magnetic fields and forces using these permanent magnets. The iron filings made these much easier to see. As we observed first-hand in this lab, the opposite poles of the magnets attract and when brought close enough, the magnetic force tend to join the magnets. We also observed how like poles repel and the magnets push away from each other when brought close. You can apply this to the Earths magnetic field using a compass. The north end of a compass magnet is drawn to align with the Earth's magnetic field. Because the Earth's North Pole attracts the "north" ends of other magnets, it is technically the Earths South Magnetic Pole. The students now have a better understanding of how magnets work and directions of field lines and force. 4

5 Questions: 1. The magnetism of a magnet can be destroyed by what? Heat, hammering, or inductive force of another. 2. What is a material that is slightly repelled by a magnetic field is known as? A diamagnetic material What happens when an iron piece is placed in a magnetic field? The magnetic lines of force will bend away from their usual paths in order to pass through the piece Does soft iron retain magnetism permanently? No What is the uniform magnetic field? The field in which all lines of magnetic flux are parallel and equidistant. 5

24 Magnetic Fields BIGIDEA Write the Big Idea for this chapter.

24 Magnetic Fields BIGIDEA Write the Big Idea for this chapter. Use the What I Know column to list the things you know about the Big Idea. Then list the questions you have about the Big Idea in the What