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+[[Electric Force, Field, and Potential]]
+# Summary
+* Electric field at a point = electric force on a positive test charge divided by charge = $\vec E=\frac{\vec F_E}{q}$ (unit N/C).
+* Test charge's impact on field is negligible.
+* Field lines point towards negative and away from positive. Closer lines = stronger field.
+* Net field from several charges is sum of vectors.
+* Inside a conductor in electrostatic equilibrium field is zero. Charge sits on surface, surface field is perpendicular to surface.
+* Inside a charged insulator inside can be nonzero since charge stays instead of moving to surface.