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Electric Field Generated by Two Point Charges

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This Demonstration shows the components of the electric field (green) generated by two charges and (orange) on a test charge. (You can drag the test charge.) The resultant is the red vector. The values of the electric charges are expressed in coulombs; the angles of the vectors that join the charges to the test charge are also shown.

Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA

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The electric field can be computed as

,

where , is the permittivity of free space, and is the unit vector.

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