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Electric Fields

Electric Fields. Chapter 21. 21.1 Creating & Measuring Electric Fields. The electric force varies inversely as the square of the distance between two point objects. How can a force be exerted through empty space?

brittany-shaffer
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Electric Fields

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  1. Electric Fields Chapter 21

  2. 21.1 Creating & Measuring Electric Fields • The electric force varies inversely as the square of the distance between two point objects. • How can a force be exerted through empty space? • Michael Faraday suggested because of an electrically charged object changing the properties of space

  3. Electric Field • The changed property of space is the electric field • The electric field means that the interaction is not between two objects, but between an object and the field at the location of the object.

  4. Electric Field • How is the electric field measured? • Place a small positively charged object in the space, if there is a force on the object, there is an electric field. • According to Coulomb’s law the force and the charge are directly proportional. • So divide F by q (test charge) and get a vector quantity representing the electric field at a certain point.

  5. Electric Field Strength • The direction of an electric field is the direction of the force on a positive test charge. • The magnitude of the electric field is measured in N/C.

  6. Picturing the Electric Field • Electric field is a vector quantity so use an arrow to represent the direction of a positive test charge and the number of arrows and spacing between lines represent the strength • These are electric field lines

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