A positively charged particle is at the origin of an x-axis. The potential difference between the points on the axis at x = 1.0 , m and x = 2.0 , m due to the particle is 0.90 , V.
(a) 0.45 , V
(b) 0.90 , V
(c) 1.35 , V
(d) 1.80 , V