A student wraps copper wire around an iron nail. Then she connects the ends of the wire to a battery, making an electromagnet. She notices that if she wraps more coils of wire around the bolt, then her electromagnet can pick up more paper clips. What conclusion can she draw?(
1More coils of wire increases the mass of the battery
More coils of wire increases the mass of the battery
2More coils of wire increases the strength of the electromagnet
More coils of wire increases the strength of the electromagnet
3More coils of wire increases the length of the nail
More coils of wire increases the length of the nail
4More coils of wire increases the density of the copper wire
2. More coils of wire increases the strength of the electromagnet
The conclusion the student can draw is option 2: More coils of wire increases the strength of the electromagnet.
The conclusion she can draw is that more coils of wire increase the strength of the electromagnet.
To understand why this happens, let's recall the basic principle of electromagnets. An electromagnet is created by passing an electric current through a coil of wire, which generates a magnetic field. The strength of the magnetic field produced by the electromagnet depends on the number of turns, or coils, of wire around the iron nail.
When the student wraps more coils of wire around the iron nail, the length of wire passing through the magnetic field created by the battery increases. This, in turn, strengthens the magnetic field generated by the electromagnet. The stronger the magnetic field, the more paper clips the electromagnet can attract.
Therefore, the correct conclusion is option 2: More coils of wire increase the strength of the electromagnet.