Question

section 3 electromagnet use the following information to answer the questions. an electromagnet is a type of magnet in which a term that is usually not magnetic, such as an iron nail, has an electric field in order to become a magnet. a student builds an electromagnet using a battery, a plastic nail, and some thin insulated wire. the wire is wrapped around the nail 10 times and then connected to the battery. 1 what changes could the student make to increase the strength of the electromagnet? (a) select all that apply. there are three (3) correct answers. a replace the plastic nail with an iron nail b replace the wire with a wire that has less resistance c wrap more loops of the wire around the nail d remove half of the loops around the nail e increase the length of the wire f decrease the voltage of the battery (b) when creating the electromagnet, there were several possible independent variable mentioned. those variables included the resistance of the wire, the number of loops around the nail, and the type of nail. all of these changes would be made in order to test the strength of the electromagnet, which would be the independent variable. if a student decides to compare various numbers of loops of wire around the nail, the voltage of the battery and the type of nail used would need to be dependent variable

Explanation:

Step1: Understand electromagnet strength factors

The strength of an electromagnet depends on factors like the core material (ferromagnetic materials like iron enhance it), the current (lower resistance wire allows more current for a given voltage), and the number of turns (more turns increase the magnetic field).

Step2: Analyze each option

• Option A: Plastic is non - ferromagnetic. Iron is ferromagnetic. So replacing plastic with iron increases strength.
• Option B: Using a wire with less resistance (by Ohm's law \(I=\frac{V}{R}\), for a fixed \(V\), lower \(R\) means higher \(I\)) increases the current, which increases electromagnet strength.
• Option C: More loops (turns) of wire around the nail increase the magnetic field (as \(B\propto N\) for a solenoid - like electromagnet where \(N\) is the number of turns).
• Option D: Removing half of the loops (\(N\) decreases) would decrease the strength.
• Option E: Increasing wire length (assuming cross - section is constant) increases resistance (\(R=

ho\frac{l}{A}\)), which decreases current (by \(I = \frac{V}{R}\)) and thus strength.

• Option F: Decreasing battery voltage (for a fixed \(R\)) decreases current (\(I=\frac{V}{R}\)) and thus strength.

Answer:

A. Replace the plastic nail with an iron nail, B. Replace the wire with a wire that has less resistance, C. Wrap more loops of the wire around the nail