Final answer:
The subject of this question is Electric Fields (option A). A charged rod can create an electric field around it. Electric fields are vectors that represent the force experienced by a positive test charge placed in the field.
Step-by-step explanation:
The subject of this question is Electric Fields (option A).
A charged rod can create an electric field around it. Electric fields are vectors that represent the force experienced by a positive test charge placed in the field. The direction of the electric field is defined as the direction that a positive test charge would experience a force when placed in the field.
In the case of a thin nonconducting rod that carries a uniform charge, the electric field will be strongest near the rod and will point away from the rod in all directions.