5:Electric Charges and Fields
9:Current and Resistance
11:Magnetic Forces and Fields
12:Sources of Magnetic Fields
Electric Charges and Fields
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.)
▭ 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
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.