The answer is A. the moving charge induces a magnet field .
Answer:
The moving charge induces a magnetic field
Explanation:
According to Faraday's Law, the moving charges in a closed circuit (conductor) induces a magnetic field.
There is a potencial difference called electromotive force, wich is proportional to the magnetic flux through a surface. Matematically this coud be written as
[tex]\epsilon = -\frac{d\Phi}{dt}[/tex]
where [tex]\epsilon[/tex] is the EMF, and [tex]\Phi[/tex] is the magnetic flux (the derivative on t means that the magnetic flux is changing in time).
This means that the moving charges, generates an EMF that is proportional to the magnetic flux change.
Therefore, A is the correct answer.
