Four identical charges q1 = q2 = q3 = q4 = 2.5μC represented as blue circles in the picture lie on the corners of a squa

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Four identical charges q1 = q2 = q3 = q4 = 2.5μC represented asblue circles in the picture lie on the corners of a square of sidelength .5m. (Hint: use a coordinate system where the center of thesquare is the origin, and the sides of the square are parallel tothe x or y-axes.) (a) What is the electric field in at the center of the greencircle in the picture? (It’s the center of the square.)(b) A .5μC charge is placed at this point. What is the net force onthe charge?(c) What is the electric field at the center of the red circle inthe picture?(d) The same .5μC charge is placed at this point; what is the netforce on the charge?
Three charges lie in a vertical line with q1 = 1.0μC .10m aboveq2 = −1.0μC which is .15m above q3 = −4.5μC.(a) What is the electric field .5m above q1?(b) What is the electric field .5m below q3?

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.25m 91 93 .5m 92 94 5m