69. In a certain region, the electric field along the x -axis is given by
E=ax+b,wherea=40V/m2 and b=4V/m.
The potential difference between the origin and x=0.5m is
(A) -36 V
(B) -7 V
(C) -3 V
(D) 10 V
(E) 16 V
(A) -36 V
(B) -7 V
(C) -3 V
(D) 10 V
(E) 16 V