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Coulomb’s Law and Electric Fields

Coulomb’s Law and Electric Fields. Forces between Charges. Vary directly with amount of charge Vary by the inverse square of distance. Coulomb’s Law. k = 9 x 10 9 Nm 2 /C 2. Another Form. ε o = 8.85 x 10 -12 C 2 /Nm 2. Force Characteristics.

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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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