A student wraps, 10 coils of copper wire around an iron bolt and then she connects the ends of the wire to a battery. Next, the student uses the nail to lift paper clips. She then conducts a second trial, using the same wire, battery and nail that with 30 coils of copper wire, wrapped around bolt what will happen in the second trial? A. The boat will have the same number of paper clips, because both trials use the same type of battery.B. The boat we left last paper clips, because more conductive material in the system will balance more paper clips.C. The boat will lift more paper clips, because more coils of wire produces a stronger magnetic field.D. The boat with with the same number of paper clips, because both trials use the same type of paper clips.
C. The bolt will lift more paper clips, because more coils of wire produce a stronger magnetic field.
Wrapping more coils of copper wire around the iron bolt (in this case, going from 10 to 30 coils) effectively increases the magnetic field produced when the electric current flows through the wire from the battery. Each coil contributes to the strength of the magnetic field generated in the iron bolt when current is applied.
In electromagnetism, the strength of the magnetic field generated by an electric current through a wire is proportional to the number of turns in the coil and the current passing through it (as long as the iron core is not saturated). With more coils around the iron bolt, the magnetic field is stronger, thus the bolt can magnetize more strongly. This increased magnetization allows the bolt to lift more paper clips in the second trial compared to the first one.
The other options (A, B, and D) are incorrect interpretations of how electromagnets work. The number of paper clips that can be lifted is not solely dependent on the type of battery or the type of paper clips; it's significantly affected by the strength of the magnetic field, which in this experiment is directly tied to the number of coils.