Four Charged Particles (Two Having a Charge $+ Q$ And Two Having a Charge

Four charged particles (two having a charge $+ Q$ and two having a charge $- Q$ ) are arranged in the $x y$ -plane as shown in the figure. The charges are all equidistant from the origin. The amount of work required to move a positively charged particle from point $P$ to point $O$ (both of which are on the $z$ -axis) is

A) positive.
B) negative.
C) zero.
D) depends on the path in which the charged is moved.

Correct Answer:

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