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19.4 Exercise 5

Avg difficulty 2.5

How much work is necessary to keep a positive point charge in orbit around a negative point charge?

  1. A lot; this system is unstable.
  2. Just a little; the isolines are far enough apart that crossing them doesn’t take much work.
  3. None; we’re traveling along an isoline, which requires no work.
  4. There’s not enough information to tell.

OpenStax College Physics 2e, 19.4 Equipotential Lines, exercise 5

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.