Final answer:
A positive test charge in an electric field will move along the field lines, being repelled by positive charges and attracted to negative charges, following Coulomb's law.
Step-by-step explanation:
If a positive test charge is placed in an electric field, it experiences a force in the direction of the electric field lines. In the presence of a single positive charge, the test charge will be repelled away from it because like charges repel each other as per Coulomb's law. If placed between a positive and negative charge, the test charge will be attracted toward the negative charge and repelled from the positive, moving along the force field lines toward the negative charge.
When far away from two negative charges, the electric field appears similar to one produced by a single charge of twice the magnitude. However, if a positive test charge is placed near two negative charges, it will be attracted to both, leading to a more complex motion. The exact path of the charge will depend on its initial placement within the electric field.
Remember, electric field lines provide information about the direction and strength of the force that a positive test charge would experience at any given point in the field.