Which of the following statements are true? Select all that apply.
a) Electric field lines near positive point charges radiate outward.
b) The electric force acting on a point charge is proportional to the magnitude of the point charge.
c) Electric field lines near negative point charges circle clockwise.
d) In a uniform electric field, the field lines are straight, parallel, and uniformly spaced.
e) The electric field created by a point charge is constant throughout space.