Electric field lines always begin at charges (or at infinity) and end at charges (or at infinity). One could also say that the lines we use to represent an electric field indicate the direction in which a test charge would initially move when released from rest. Which of the following fills in the three missing words correctly?

a. (positive; negative; negative)
b. (positive; negative; positive)
c. (negative; positive; negative)d. (negative; positive; positive)

b)

Explanation:

By convention, the electric field lines (which are tangent to the direction of the electric field at a given point) always begin at positive charges, and finish at negative charges.

This is a consequence of the convention that states that the electric field has the direction of the trajectory of a positive test charge when released from rest in an electric field.

(As the positive charge would move away from positive charges and would  be attracted by negative ones).

So, the combination of answers that is true is b) (positive, negative, positive).

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