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A point charge + q is placed at the origin. A second point charge +9q is placed at (d, 0, 0) in Cartesian coordinate system. The point in between them where the electric field vanishes is:

1. (d/4, 0, 0)
2. (d/3, 0, 0)
3. (3d/4,0,0)
4. (4d/3, 0,0)

Correct answer: (d/4, 0, 0)

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