Electric Field of Point-Charges: Four tiny charged particles (two having a charge +Q and two having a charge -Q) are distributed on the x- and y-axes as shown in the figure. Each charge is equidistant from the origin. In which direction is the net electric field at the point P on the y-axis?
A. directly up (in the +y direction)
B. directly left (-x direction)
C. upwards and towards the left
D. upwards and towards the right
E. The net field is zero, so there is no direction.
Answer: C
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