Use part a to (rather simply) obtain a formula for the voltage V(x,y,z) arising from a single point charge. a) V(x,y,z)=kq/x2+y2+z2
b) V(x,y,z)=kQ⋅x2+y2+z2
c) V(x,y,z)=kq/x+y+z
d) V(x,y,z)=kQ⋅(x2+y2+z2)