Electric Field Due to a Point Charge
The electric field produced by a point charge q can be obtained in general terms from Coulomb’s law.
First note that the magnitude of the force exerted by the charge q on a test charge q0 is
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then divide this value by q0 to obtain the magnitude of the field.
If q is positive, E is directed away from q. On the other hand, if q is negative, then E is directed towards q.
