What fields do stationary charges and constant-rate moving charges produce?
Stationary charges produce time-independent electrostatic fields; constant-rate moving charges produce time-independent magnetostatic fields.
What force does the electric field measure per unit test charge?
The force experienced by a test charge per unit charge.
What does Coulomb’s law specify for the direction of a point charge’s electric field?
From the source charge toward the field point.
What do the integral static Maxwell equations relate to electric flux?
Electric flux equals the enclosed charge.
How do electric-field lines relate to equipotential surfaces and potential?
They are perpendicular to equipotential surfaces and point toward decreasing potential.
How is the potential difference from A to B defined using work and charge?
The supplied work divided by the positive test charge.
What makes electrostatic circulation between fixed endpoints path-independent?
The field has zero circulation around every closed loop.
What does Gauss’s law relate the electric flux through a closed surface to?
The enclosed charge divided by permittivity.
Where can electric-field lines cross?
Only at point charges or where the electric field is zero.
What symmetry makes Gauss’s law especially useful for calculating an electric field?
A high degree of symmetry in the charge distribution.
Answer 10 questions on Electrostatics and Electric Dipoles.
1. Which statement correctly distinguishes the sources of electrostatic and magnetostatic fields?
2. A closed surface encloses electric charge, and a closed loop lies in an electrostatic field. Which statement describes the corresponding integral relations?
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