Web assignment based on an applet by Physics 1. User is given three point charges and asked about the electric field strengths and directions at various locations around the charges.
Under an hour
Electric field, Coulomb's law, charge distribution, vector addition, vector algebra.
Second semester, introductory physics
Qualitative summation of vectors, Coulomb's law.
To understand how the the strength of an electric field varies around various point charges. Also, to practice the ability to sum vectors and to understand how the strength of an electric field is represented by a field plot.
Text of Learning Exercise: