When a proton enters a region where an electric field is present, with the initial velocity ?⃗ v → will always move:
a along the field line, in the positive direction of the line.
b. along the field line, in the negative direction of the line.
c. from the point with positive potential to the point with negative potential.
d. from the point with negative potential to the point with positive potential. and. as described in both (a) and (c).
