The scalar electrical potential in free space is given as V$($vec$($r$))=2$yx$^2-5$z V$.$

In this case, for point P$(1,1,0)$; Find

a$)$ Electric field intensity vector vec$($E$),$

b$)$ Electric Flux Density vector vec$($D$),$

c$)$ Charge density $\backslash$rho v$.$

d$)$ Find the total load inside the cube whose center is the origin and whose edges are $1$ m$.$