Potential of Point-Charges: Four charged particles (two having a charge +Q and two having a charge -Q) are arranged in the xy-plane, as shown in the figure. These particles are all equidistant from the origin. The electric potential (relative to infinity) at point P on the z-axis due to these particles, is
A. zero.
B. positive.
C. negative.
D. impossible to determine based on the information given.
Answer: A
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