Illustration Electric field lines - force on a test charge

For example, if a negative test charge is placed at some location in the E-field of an electric dipole, then that test charge experiences a repulsive force $$\boldsymbol{F}_1$$ from the negative charge and an attractive force $$\boldsymbol{F}_2$$ from the positive charge. The resulting force $$\boldsymbol{F}$$ points tangentially along the field line, but moves against the field lines (in the opposite direction).