OpenStax University Physics/E&M/Electric Charges and Fields

(Vol. 2):    5:Electric Charges and Fields    6:Gauss's Law    7:Electric Potential    8:Capacitance    9:Current and Resistance    10:Direct-Current Circuits    11:Magnetic Forces and Fields    12:Sources of Magnetic Fields    13:Electromagnetic Induction    14:Inductance    15:Alternating-Current Circuits    16:Electromagnetic Waves


Chapter 5 edit

Electric Charges and Fields edit

Coulomb's Law   where the vacuum permittivity   8.85×10−12 F/m.

Elementary charge = e = 1.602×10−19C (electrons have charge q=−e and protons have charge q=+e.)

Dipole moment

▭ By superposition,   where  
▭ Electric field   where   is the field at   due to charges at  
▭ The field above an infinite wire   and above an infinite plane  
▭ An electric dipole   in a uniform electric field experiences the torque  

For quiz at QB/d_cp2.5 edit

  8.85×10−12 F/m = vacuum permittivity.

e = 1.602×10−19C: negative (positive) charge for electrons (protons)

  = 8.99×109 m/F



  = field above an infinite plane of charge.