In the picture below, the 3 charges Q 1 , Q 2 and Q 3 are located at positions (

Question

In the picture below, the 3 charges Q1, Q2 and Q3 are located at positions (-a,0), (a,0) and (0,-d) respectively. (The origin is the point halfway between Q1 and Q2.)

In the picture below, the 3 charges Q1, Q2 and Q3 are located at positions (-a,0), (a,0) and (0,-d) respectively. (The origin is the point halfway between Q1 and Q2.) Consider the special case where Q1, Q3 greater than zero and Q2 = -Q1. Assume that the zero of potential is at infinity, as is normal for point charges. Which of the following statements are true? (Choose all correct answers e.g. ABD, CDFG). he electric potential at any point along the y-axis is positive. The force on Q3 due to the other two charges is zero. If Q3 is released from rest, it will initially accelerate to the right. The electric potential at the origin equals Q3/(4*pi*epsilon0*d). The work required to move Q3 from its present position to the origin is zero. The external work done to bring these charges to this configuration (from infinity) was positive. The electric field at the origin points in the positive y direction, away from Q3.

Explanation / Answer

Along the y axis the potential due to Q1 & Q2 will cancel so the potential on y-axis is due only to Q3 and is = k*Q3/r

The electric potential at any point along the y-axis is positive. TRUE

The external work done to bring these charges to this configuration (from infinity) was positive. FALSE

The work required to move Q3 from its present position to the origin is zero. TRUE

The electric potential at the origin equals Q3/(4*?*?0*d). TRUE

If Q3 is released from rest, it will initially accelerate to the right. TRUE

The electric field at the origin points in the positive y direction, away from Q3. FALSE

The force on Q3 due to the other two charges is zero. FALSE

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