Which of the following statements about electric field lines are true? (choose all that are true) a) They are only defined for positive charges.

b) They are always tangent to electric field vectors.

c) They are always perpendicular to charged surfaces.

d) They are a simple way to visualize the electric field vectors. e) None of the above.

Answer: b) TRUE and d) TRUE

Explanation: a) FALSE the electric field lines are used to represent the charges postives and negatives.

b) TRUE it is the definition of electric field lines, they are tangent to the electric field vector.

c) FALSE the electric field lines only for conductor are perpendicular to the surface in other any situation there is a tangencial electric field components.

d) TRUE since it is a way to describe and imagine the effect of vectorial fields.

e) FALSE