# PHYS320 Lab 30 Magnetic Fields

Experiment 1: Exploring Magnets

Questions

1. The stack of magnets works as one big bar magnet. Do the poles change when you divide the magnet into pieces?

2. In step 3, do both sides of the magnet attract the metal surface? Explain how a single magnet can repel the rest of the stack, but still stick to the other surface.

3. How does the magnet attract something that is originally non-magnetic?

4. Does the bolt become magnetized when in contact with one of the permanent magnets? How is this similar to the electric charge in a conductor?

Experiment 2: Levitating Magnets

1.Draw the results of steps 2 through 4 in the space below. Why are the magnets spaced in such a way? Label the north and south poles of each single magnet.

2.Draw the result of step 5 in the space below. Was the force between the magnets enough to keep the large group levitated?

3. Label the north and south poles of each magnet in your drawing above. Add in the magnetic field lines between magnet groups.

4.What does this experiment demonstrate about the relative strengths of the forces due to gravity and magnetism? 1

Experiment 3: Magnetic Field Lines

1.Describe the direction of the compass needle as you moved it around the bar magnet. Which direction did the needle point? How far away did the compass have to be?

2.The compass points toward Earth’s geographic North Pole—which is actually the Earth’s magnetic South Pole. Knowing this, which end of the magnet is the South Pole and which is the North Pole?

3.How do the iron filings compare to your predicted magnetic field lines?

4.Describe the direction of the magnetic field lines between two attracting magnets compared to two repelling magnets.

5.Is it possible to distinguish the north and south poles of the stack of magnets by looking at the magnetic field lines they produce?

Experiment 4: Building an Electromagnet

Questions

1.In what direction will the magnetic field travel through the nail? Predict this using the right hand rule and the direction of current flow (positive terminal to negative on the battery).

2.From your answer in Question 1, which end will be the north pole of your electromagnet, and which one will be the south? Remember, the direction of the magnetic field is outward from the North Pole and inward toward the South Pole.

3.Draw a sketch of the magnetic field lines for your electromagnet.

4.Were your predictions about the north and south poles of the magnet correct? How do you know?

# Photos

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