Two point particles, with charges of q1 and q2, are placed a distance r apart. The electric field is zero at a point P between the particles on the line segment connecting them. We conclude that: q1 and q2 must have the same magnitude and sign P must be midway between the particles q1 and q2 must have equal magnitudes and opposite signs q1 and q2 must have opposite signs and may have different magnitudes q1 and q2 must have the same sign but may have different magnitudes
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