Question

The moving charge in the wire causes the compass to deflect; this is because

A. the moving charge induces a magnet field
B. the energy of the charge pushes on the compass
C. the electrons heat up the wire, causing the compass to deflect

Answer 1

The answer is A. the moving charge induces a magnet field .

Answer 2

The moving charge induces a magnetic field

Step-by-step 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

`\epsilon = -(d\Phi)/(dt)`

where
`\epsilon` is the EMF, and
`\Phi` 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.