What formula gives the strength of an electric field, e, at a distance from a known source charge? e = startfraction f subscript e baseline over q times d endfraction. e = startfraction k times q over d endfraction. e = startfraction k times q over d superscript 2 baseline endfraction. e = startfraction f subscript e baseline over d endfraction.

Explanation:

The electric field E is derived from the electric Coulomb Force () between two charges located at a distance "d" from each other, by using positive test charge in the following expression:

tex]E=\frac{F_C}{q}[/tex]

and where the Coulomb force between a charge Q and another one q (the test charge) is giving by:

 where K represents the Coulomb constant.

Since the field is the force per unit charge using a positive test charge, the field's units will be in units of Newtons/Coulomb, and the formula for the field would be modified so as only one charge (Q - the one producing the field) will appear in the numerator:

The strength of an electric field E produced by a single charge Q at a distance d from it is therefore given by the formula: .

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