Talk:QB/a18ElectricChargeField findE

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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.

is the electric field at the field point, , due to point charges at the source points, , and points from source points to the field point.