Answer:- Arrow A represents the direction of the net force on the fifth charge.
Explanation:
In electrostatics, positive (like) charges repel each other and negative (unlike) charges attract each other.
The two positive charges have the same magnitude and they apply force on the fifth charge in opposite direction i.e. direction denoted by the arrows C and D. Therefore, the fifth charge does not get affected by these two charges.
Now,
The charge will attract the fifth charge towards itself in the direction denoted by arrow A.
The charge will repel the fifth charge away from it in the direction denoted by arrow A.
Thus, the net force on the fifth charge is addition of force due to these two charges only in the diagonal direction denoted as arrow A.
Therefore, arrow A represents the direction of the net force acting on the fifth charge at the center.
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