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The following point charges are available: a) -7.5 (μC) at point (20, -50) b) +4.8 (μC)...

The following point charges are available:

a) -7.5 (μC) at point (20, -50)
b) +4.8 (μC) at point (-40, -80)
c) -5.5 (μC) at point (0, 60)


What is the vector (magnitude and direction) of the electric field at point (10, 10)?
Note: the coordinates of the points are given in centimeters.

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