A uniform electric field has a magnitude E and is directed in the negative x-direction. What is the magnitude of the electric field if the potential difference between point A (at x = 0.70 m) and point B (at x = 0.90 m) is 320 V?
a) 640 N/C
b) 800 N/C
c) 960 N/C
d) 1060 N/C
