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The problem asks us to use superposition principle to calculate electric field due to two point...

The problem asks us to use superposition principle to calculate electric field due to two point charges:

Charge q1=7.00 uC, at origin

Charge q2 = -5.00 uC, 0.300 m from origin.

Find magnitude and direction of the electric field at point P, which has coordinates (0, 0.400)m.

I understand how to find magnitude, but am confused as to the direction. I know we need to find x and y-coordinates, but the solution in the book talks about adding the vectors as well.

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