A 10 µC point charge is located at (0, -2, 0). A 10 µC point charge is located at (0, 2, 0). A 10 µC charge is located at (2, 0, 0).
a) Find the force on point charge K, which possesses a 5 mC point charge and is located at (0, 0, -4).
b) Find the electric field intensity at (0, 0, -4)
c) If charge is placed at (-3, 0, 0), what is the Q of the charge that makes D = 0 at K.