Four point charges, Q1(-15,0,15), Q2(15,0,15), Q3(15,0,-15) and Q4(-15,0,-15) in cartesian coordinates are surrounded with air. Q1 = -Q4 = 2 microCoulomb
a) If charges Q2 = Q3 = 0, Find vectors E and D where E is the Electric Field Intensity and D is the Electric Flux Density.
b) If charges Q2 = -Q3 = 2 microCoulomb, Find the forces applied to each point from other charges.