Electric field

• How to Interpret a Graph of Electric Potential
  Learn how to read electric-potential graphs, calculate electric field from their slope, and interpret straight, curved, flat, and discontinuous regions.
• How Are Coulomb’s Law and Electric Field Intensity Related?
  Coulomb’s law gives the force between charges; electric field intensity is the force per unit positive test charge at a point.
• What Is the Electric Field Around a Current-Carrying Conductor?
  A steady current needs a longitudinal electric field inside a resistive wire; the field outside depends on surface charges, voltage, and the return-path geometry.