In the picture above, the 3 charges Q_1, Q_2, and Q_3 are located at positions (

Question

In the picture above, the 3 charges Q_1, Q_2, and Q_3 are located at positions (-a, 0), (a, 0) and (0, -d) respectively. (The origin is the point halfway between Q_1 and Q_2.) Consider the special case where Q_1, Q_3 > 0, and Q_2 = Q_1. Which of the following statements are true? The electric field at the origin points in the positive y direction, away from Q_3. The work required to move Q_3 from its present position to the origin is zero. The electric potential at the origin equals Q_3/(4*n* epsilon_0*d). If Q_3 is released from rest, it will initially accelerate to the right. The force on Q_3 due to the other two charges is zero. The electric potential at any point along the y-axis is positive. The external work done to bring these charges to this configuration (from infinity) was positive.

Explanation / Answer

Electric field due to 1 and 2 will be along +x axis

1) False

2) True

3) False

4) True

5) False

6) True

7) False

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