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A point particle of charge Q is located at P along the axis of an electric dipole 1 at a distance r as shown in the figure. The point P is also on the equatorial plane of a second electric dipole 2 at a distance r. The dipoles are made of opposite charge q separated by a distance 2a. For the charge particle at P not to experience any net force, which of the following correctly describes the situation?

1. 20 r a −
2. 10 ~ r a
3. 5 . 0 ~ r a
4. 3 ~ r a

Correct answer: 3 ~ r a

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