Lab 8: Electromagnet Online Version Introduction 1. A bar magnet is shown below. At points A, B, C and D label the direction a compass would point. 2. Compare and contrast a bar magnet to an electromagnet. 3. What do you think you would have to do to make a light bulb light using a magnet?

2 Experiment: Electromagnet Open the PhET simulation Faraday's Electromagnetic Lab: https://phet.colorado.edu/en/simulations/faraday/about. Investigate the simulation and use the simulation to answer the following questions. 1. What does the magnetic field look like around the bar magnet? 2. What makes the compass needle point North? 3. Make a list of ways to get the light bulb to light. 4. How can you increase the brightness of the light bulb? 5. Investigate tabs 3 and 4 (electromagnet and transformer). What are the similarities and differences between an electromagnet and bar magnet? 6. How does using AC current in an electromagnet affect a compass? 7. The phenomenon that you have seen (lighting a light bulb with a magnet) is called induction. What does nduction means based on the previous questions you answered.

3 8. Design an experiment to investigate how a variable, of your choosing, will affect the amount of induction, where induction is the amount of emf produced across a circuit in a changing magnetic field. a. What variable are you investigating? b. How will you measure the amount of induction? c. What do you predict will be the result to induction of changing your variable? d. Describe how you would test this with the simulation. e. Now test it. Make data table that illustrates what variable you changed and how it impacted induction. f. What can you say about the relationship between your chosen variable and induction?

of O ZOOM + Lab 8: Electromagnet Dnline Version Introduction 1. A bar magnet is shown below. At points A, B, C and D label the direction a compass would point. A 2. Compare and contrast a bar magnet to an electromagnet. 3. What do you think you would have to do to make a light bulb light using a magnet? of O ZOOM + Experiment: Electromagnet Open the PhET simulation Faraday's Electromagnetic Lab: httos://Phet.coloradoedufenfsimulationsffaradayfabout. Investigate the simulation and use the simulation to answer the following questions. 1. What does the magnetic field look like around the bar magnet? 2. What makes the compass needle point North? 3. Make a list of ways to get the light bulb to light. 4. How can you increase the brightness of the light bulb? 5. Investigate tabs 3 and 4 [electromagnet and transformer]. What are the similarities and differences between an electromagnet and bar magnet? 6. How does using AC current in an electromagnet affect a compass? Page