Two particles have charges Q and -Q (equal magnitude and opposite sign). For a net force of zero to be exerted on a third charge it must be placed:
A) midway between Q and -Q
B) on the perpendicular bisector of the line joining Q and -Q, but not on that line itself
C) on the line joining Q and -Q, to the side of Q opposite -Q
D) on the line joining Q and -Q, to the side of -Q opposite Q
E) at none of these places (there is no place)
E) at none of these places (there is no place)
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