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

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(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

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Electric Charges and Fields

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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

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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.