The answer is not ACEG or ABCEG Help me with B please as well In the picture bel

Question

The answer is not ACEG or ABCEG
Help me with B please as well

In the picture below, the 3 charges Q_1, Q_2 and Q_3 are located at positions (-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 greater than zero and Q_2 = Q_1. Which of the following statements are true? (Choose all correct answer e.g. ABD. CDFG) The electric potential at the origin equals Q_3/4 pi e_0 d The electric field at the origin points in the positive y direction, away from Q_3 The external work done to bring these charges to this configuration (from infinity) was positive. The work required to move Q_3 from its present position to the origin is zero. 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. In the previous problem, let Q_1 = 1.80 mu C, Q_2 = 3.00 mu C, and Q_3 = 4.00 mu C. Tries 0/8

Explanation / Answer

part 1)
A) True

B) True

C) False

D) True

E) True

F) False

G) False

so, the answer is ABDE

part 2)

Total electric potential energy of the configuration,

U = k*Q1*Q2/d12 + k*Q2*Q3/d23 + k*Q3*q1/d31

= 9*10^9*1.8*3*10^-12/(2*0.012) + 9*10^9*3*4*10^-12/sqrt(0.012^2 + 0.028^2) + 9*10^9*4*1.8*10^-12/sqrt(0.012^2 + 0.028^2)

= 7.70 J

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