50.0pJ of energy is stored in a 3.00cm × 3.00cm × 3.00cm region of uniform electric field. What is the strength of the field?

Answer 1

energy/volume = 0.5 * epsilon * E^2
E = (50)/(0.03)^3 = 0.5 * *8.85E-12)E^2
50/(0.03)^3 = 4.425 * E^2
E = sqrt (50/(0.03)^3/4.425
E = 646.9138997 V/m