A point charge +Q is fixed at the origin. A point charge −2Q is fixed on the x–axis at x = 2d. Four points are defined as follows:
• A at (d, 0)
• B at (3d, 0)
• C at (0, d)
• D at (2d, d)
Rank the magnitudes of the net electric field at points A, B, C, and D from greatest to least.
a) B > D > A > C
b) D > A > B > C
c) A > D > B > C
d) A > B > D > C