The figure shows a system consisting of three charges, q1=5μC, q2=5 μC, and q3= -5 μC, at the vertices of anequilateral triangle of side d= 2.7 cm. A) Find the magnitude of the electric field at a point halfwaybetween the charges q1 and q2.
B) Is the magnitude of the electric field halfway between thecharges q2 and q3 greater than, less than, or the same as theelectric field found in part (a)? Explain.
C) Find the magnitude of the electric field at the pointspecified in part (b).

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.