Fields are Invisible but can be Detected and Measured...Reconsidered

• This is true in many cases, but not always.
• The visible part of the electromagnetic spectrum (light) is in fact visible; our eyes are detectors.
• Most of the electromagnetic spectrum is invisible and often unperceived, yet pervasive, such as radio waves.

Fields Exist
Fields are Three-Dimensional
Fields Pass through some Objects
Fields may be Blocked or Altered by some Objects
Fields are Created by Sources
Fields Map the Strength and Direction of Forces exerted by Sources

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