Final answer:
The subject of this question is Magnetic Fields. Ampere's Law states that the magnetic field produced by a current in a long straight wire is proportional to the current and the distance from the wire. To deduce the current in the wire, you would need to measure the radius of the circular path of the electrons and the average distance between the electrons and the wire.
Step-by-step explanation:
The subject of this question is Magnetic Fields. In this scenario, Ampere's Law is applicable. Ampere's Law states that the magnetic field produced by a current in a long straight wire is proportional to the current and the distance from the wire. To deduce the current in the wire, you would need to measure the radius of the circular path of the electrons and the average distance between the electrons and the wire.