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Coulomb’s Law and Electric Fields

Explore how Coulomb’s Law governs the forces between charges, varying directly with the charge amount and inversely with distance squared. Learn about force characteristics, field intensity units, and equations for electric fields. Discover how to calculate forces between multiple charges and find electric fields caused by more than one point charge.

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Coulomb’s Law and Electric Fields

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  1. Coulomb’s Law and Electric Fields

  2. Forces between Charges • Vary directly with amount of charge • Vary by the inverse square of distance

  3. Coulomb’s Law k = 9 x 109 Nm2/C2

  4. Another Form εo = 8.85 x 10-12 C2/Nm2

  5. Force Characteristics • Force directed along imaginary line joining the two charges • Force on each charge in the pair equal in magnitude, opposite in direction - +

  6. 3 or more? To find the force between 3 or more charges, must perform Coulomb’s Law pair by pair and add the forces as vectors.

  7. Isolated Charge qo F Unit of electric field intensity = N/C

  8. Another E-Field equation Electric Field due to a point charge

  9. More than one? To find the electric field caused by 2 or more point charges, must use the equation for each one and add the vectors. q1 X q2

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