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Illustration Quadrupole - electric field lines

<span>Quadrupole - electric field lines</span>
Quadrupole - electric field lines
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The electric field \(\boldsymbol{E}\) generated by four charged electric point charges (two negative, two positive). By definition, the electric field lines start at a positive charge and end on a negative charge. When a test charge is placed in this electric field, it experiences an electric force acting on the test charge tangential to the field lines.