A: Electric field created by a point charge is non-uniform.
R: Electric field at a distance ‘r’ from a point charge ‘q’ is 
$E=\frac{1}{4\pi {\epsilon }_0}\frac{q}{r}$

Both A and R are true but R is not the explanation for A

Both A and R are true and R is the correct explanation of A

A is true and R is false

A is false and R is true