Two Point Charges, a and B, Lie Along a Line

question 17

Multiple Choice

Two point charges, A and B, lie along a line separated by a distance L. The point x is the midpoint of their separation.
-Which combination of charges will yield zero electric field at the point x?

• A)+1q and -1q
• B)+2q and -3q
• C)+1q and -4q
• D)-1q and +4q
• E)+4q and +4q

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