Electricity and magnetism

Coulomb's law and electric field

F = kq1q2/r2  ·  E = kq/r2

k = 9 × 10⁹ N·m²/C², q charge, r distance

Watch forInverse square, like gravity. Fields from several charges add as vectors.

Apply it · 2 questions

  1. Where the electric field is zeroElectricity, magnetism, and electrochemistry · set 5 · hard
  2. Coulomb's law: doubling the distanceElectricity, magnetism, and electrochemistry · set 4 · easy