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PRACTICE / Potential difference

Higher potential can mean lower energy

A charge of −2.0 μC moves from a point at 5 V to a point at 20 V in an electrostatic field.

What work is done by the electric field?

Organize the givens & assumptions
  • q = −2.0 μC
  • Vi = 5 V
  • Vf = 20 V

Fixed source charges, electrostatic potential difference, and only the field’s work is requested; no assumption of a particular route or speed is needed.

  1. A−30 μJ-30\ \mu\mathrm J
  2. B50 μJ50\ \mu\mathrm J
  3. C0 J0\ \mathrm J
  4. D30 μJ30\ \mu\mathrm J

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