REVIEW ELECTRIC FIELD The direction of the field is taken to be the direction of the force it would exert on a positive test charge. The electric field is radially outward from a positive charge and radially in toward a negative point charge.
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The electric field from a positive charge points away from the charge; the electric field from a negative charge points toward the charge. Like the electric force, the electric field E is a vector. If the electric field at a particular point is known, the force a charge q experiences when it is placed at that point is given by:
THE PARARALLEL PLACE CAPACITOR opposite directions, and the net electric field is zero at the place where the magnitude of E1 equals that of E2. However, since q2 is smaller than q1 this location must be closer to q2 in order that the field of the smaller charge can balance the field of the larger charge. In the drawing, the cancellation spot is labeled P, and its distance from q1 is
= 8.85 x 10^-12 C^2/(Nxm^2) (part of k constant)
18.7 ELECTRIC FIELD LINES plates.