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Experiment #23 from Exploring Physical Science

Education Level
Middle School


A magnetic field forms around a wire that has an electric current in it. Winding a wire around a piece of iron increases the strength of the magnetic field. A temporary magnet made in this way is called an electromagnet. In this experiment, you will use a Magnetic Field Sensor to study the relationship between number of wire winds and magnetic field strength of an electromagnet.


  • Build an electromagnet.
  • Measure magnetic field strength.
  • Make conclusions about the relationship between the number of wire winds and magnetic field strength.

Sensors and Equipment

This experiment features the following sensors and equipment. Additional equipment may be required.

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This experiment is #23 of Exploring Physical Science. The experiment in the book includes student instructions as well as instructor information for set up, helpful hints, and sample graphs and data.

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