A wire having uniform linear change density  $+\lambda$, is bent in the form of a ring of radius R. Point A as shown in Fig., is in the plane of ring. But not at the centre. Two elements of the ring of lengths $a_1$ and $a_2$ subtends small equal angle at the point A. They are at distance $r_1$ and $r_2$ from point A respectively  $(r_2>r_1)$:

The ratio of charge of elements $a_1$ and $a_2$ is  $\frac{r_1}{r_2}$

The element $a_1$ produces greater magnitude of electric field at A than produced by element $a_2$

The elements $a_1$and $a_2$ produce same potential at A.

If the charge of ring is reversed to negative charge (of linear density $-\lambda$), Then element $a_1$ produces greater magnitude of electric field at A than element $a_2$.