• Henry Ford College

• SOSIOLOGY 131

Pre-Lab Information Purpose Explore the connection between magnetic and electric fields using a laboratory procedure. Time Approximately 60 minutes Question How can magnetic and electric fields be demonstrated? Hypothesis If a magnetic or electric field is present, materials that generate these fields will interact by attracting or repelling each other because of their magnetic or electric properties. Variables Part I: Independent Variable: the type of material Dependent Variable: an observable magnetic field or attraction Part II: Independent Variable: the presence of charged materials Dependent Variable: an observable electric field Part III: Independent Variable: the movement of the magnet Dependent Variable: an electric current Part IV: Independent Variable: an electric current Dependent Variable: a magnetic field Summary In Part I of the experiment, students will first explore then map a magnetic field using bar magnets, a compass, and iron filings. In Part II of the experiment, students will investigate the concept of charge and demonstrate the interactions of electric fields. In Part III, students will examine how magnetic fields can generate an electric current. In Part IV, they will demonstrate how electric current can generate magnetic fields. Safety ▪ Always wear a lab coat and safety goggles when performing an experiment. ▪ Behavior in the lab needs to be purposeful. Use caution when connecting electric circuits to avoid risk of electric shock. ▪ Dropping magnets can decrease their strength over time. ▪ Do not bring bar magnets near computers, computer monitors, audio tapes, or other such magnetic devices. Strong magnets can destroy materials with magnetic properties. ▪ Always disconnect circuits when not in use to prevent loss of charge and overheating. ▪ Report all accidents—no matter how big or small—to your teacher. Lab Procedure Step 1: Gather materials. ▪ Paper clips ▪ Aluminum wire or can ▪ Plastic ruler