Teaching Physics with the Physics Suite

Edward F. Redish

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Dependence of E

In the figure at the left is shown a fixed charge (specified by a circle) and a location (specified by the x). A test charge is placed at the x in order to measure the electric effect of the fixed charge.

Complete the two statements below as quantitatively as you can. (For example, if the result is larger by a factor of three don't say “increases” say “triples” or “is multiplied by three”.) Each statement is meant to be compared with the original situation. (The changes don't cumulate.)

  1. If the test charge is replaced by one with half the amount of charge, then the electric field it sees will _______
  2. If the fixed charge is replaced by one with twice the amount of charge, then the electric field seen by the test charge will _______

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Page last modified October 31, 2002: E24