How to Shrink a Quarter with Electricity

Electrocuting metal until it shrinks sounds crazy, but it happens! Part of a larger physics playlist an intriguing video explains how an electromagnet shrinks any metal coin. The narrator discusses the electric and magnetic forces as well as various laws that apply to the process.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Research the various sites mentioned in the video and the methods they use to shrink coins
  • Make simple electromagnets in class
Classroom Considerations
  • Avoid the comments if possible, as many contain inappropriate language
  • This resource is only available on an unencrypted HTTP website. It should be fine for general use, but don’t use it to share any personally identifiable information
  • Connects art, science, and financial considerations
  • Includes warnings not to try this at home—an important reminder for students!
  • Offers subtitles in English, French, Hindi, and Spanish for ease of note taking
  • None