2. Three charged spheres are depicted below. Assume Q1 = 1.25 micro coulomb Q2 1.55 micro coulomb Q3 4.55 micro coulomb Q1 is located - 5.00 cm along the y-axis, Q2 is located - 5.0 cm along the x-axis and Q3 is located 10.0 cm along the x-axis. a) Find the magnitude and direction of the electric field at the origin b) If you now place a - 0.100 micro coulomb charge at the origin what is the magnitude and direction of force on this charge