A vector quantity given as Ē= 4y²z³ē+axyz³ē, – xy²z²ē. a) Determine the values of constants a and so that there can be ar electrostatic field created by some charges in empty space. b) In this case, obtain the explicit expression of the volumetric load density of the sources creating the area in question.

A vector quantity given as Ē= 4y²z³ē+axyz³ē, – xy²z²ē. a) Determine the values of constants a and so that there can be ar electrostatic field created by some charges in empty space. b) In this case, obtain the explicit expression of the volumetric load density of the sources creating the area in question.