Problem 3: (20% of Assignment Value)
Four point charges of equal magnitude $Q = 75 \, nC$ are placed on the corners of a rectangle of sides $D_1 = 19 \, cm$ and $D_2 = 6 \, cm$. The charges on the left side of the rectangle are positive while the charges on the right side of the rectangle are negative. Use a coordinate system where the positive y-direction is up and the positive x-direction is to the right.
Part (a)
Which of the following represents a free-body diagram for the charge on the lower left hand corner of the rectangle?
Part (b)
Calculate the horizontal component of the net force, in newtons, on the charge which lies at the lower left corner of the rectangle.
$F_x = $