Question

The uniform electric field is along positive y-axis and positive X-axis
are shown in figure. The signs of potential difference Vp - Vo and VB
Va respectively are
​

Answer 1

Explanation:

let there be a point A in an uniform elctric feild

if the point is shifted to another location B along the electric feild the the potential at A will be greater than at B .

So here in question 1

Vp>Vq by distance from a standard refereence from point of orignation of electric feild

so Vp-Vq will be positive

at question 2 be it will be the reverse, by applying the same rule