Question
The students in Mrs. Peterson's class each designed a simple electric motor using a permanent magnet and an electromagnet made up of a coil of wire wrapped around an iron core. Each motor was connected to the same voltage source, and the number of turns the motor made in 5 seconds was counted. The table below describes each student's motor.
Electric Motor Designs
Student Name Number of Turns
in Electromagnet's
Wire Coil Material of Wire Coil Thickness of Wire Used in Coil Rate at Which the Motor Spins
Lupe 15 copper 0.4 mm 17 turns in
5 seconds
Sanjay 5 aluminum 0.4 mm 4 turns in
5 seconds
Oliver 5 copper 1.2 mm 21 turns in
5 seconds
Rebekah 15 aluminum 1.2 mm 11 turns in
5 seconds
Felipe 15 aluminum 0.4 mm 7 turns in
5 seconds
Based on the data collected, the students are going to design a new motor that incorporates the best parts of each individual motor. Which of the following would most likely have the fastest rate of rotation?
A.
a motor made with 0.4 mm aluminum wire wrapped 15 times around the iron core
B.
a motor made with 1.2 mm aluminum wire wrapped 5 times around the iron core
C.
a motor made with 1.2 mm copper wire wrapped 15 times around the iron core
D.
a motor made with 0.4 mm copper wire wrapped 5 times around the iron core
Electric Motor Designs
Student Name Number of Turns
in Electromagnet's
Wire Coil Material of Wire Coil Thickness of Wire Used in Coil Rate at Which the Motor Spins
Lupe 15 copper 0.4 mm 17 turns in
5 seconds
Sanjay 5 aluminum 0.4 mm 4 turns in
5 seconds
Oliver 5 copper 1.2 mm 21 turns in
5 seconds
Rebekah 15 aluminum 1.2 mm 11 turns in
5 seconds
Felipe 15 aluminum 0.4 mm 7 turns in
5 seconds
Based on the data collected, the students are going to design a new motor that incorporates the best parts of each individual motor. Which of the following would most likely have the fastest rate of rotation?
A.
a motor made with 0.4 mm aluminum wire wrapped 15 times around the iron core
B.
a motor made with 1.2 mm aluminum wire wrapped 5 times around the iron core
C.
a motor made with 1.2 mm copper wire wrapped 15 times around the iron core
D.
a motor made with 0.4 mm copper wire wrapped 5 times around the iron core
Answers
GPT-4o mini
To determine which motor design would likely have the fastest rate of rotation, we should analyze the data given for each student’s motor and consider the factors that influence motor performance, such as the material of the wire, the thickness of the wire, and the number of turns in the electromagnet's coil.
1. **Material of Wire Coil:**
- Copper is generally a better conductor than aluminum, which often results in a more efficient electromagnet when using it.
2. **Thickness of Wire:**
- Thicker wire (1.2 mm) has lower resistance, which can allow for more current to flow, leading to a stronger magnetic field. However, it also may limit the number of turns that can be achieved in a given space, as the thicker wire occupies more volume.
- Thinner wire (0.4 mm) can be wrapped more times, increasing the magnetic field strength.
3. **Number of Turns:**
- More turns generally create a stronger electromagnet, influencing the strength of the magnetic field and thus the motor's rotation.
Now, let’s evaluate the options:
A. **0.4 mm aluminum wire wrapped 15 times:**
- A decent number of turns, but aluminum is less effective than copper.
B. **1.2 mm aluminum wire wrapped 5 times:**
- Very few turns, leading to a weaker electromagnet, despite the thicker wire.
C. **1.2 mm copper wire wrapped 15 times:**
- A good combination because copper (better conductor) with a higher number of turns could enhance the magnetic field strength, albeit the thickness might limit the number of turns if the space is limited.
D. **0.4 mm copper wire wrapped 5 times:**
- Thin wire (good conductor) but too few turns results in a weaker electromagnet.
Considering the effectiveness of copper, the number of turns, and the thickness of the wire, option **C (1.2 mm copper wire wrapped 15 times)** would likely yield the fastest rate of rotation.
So, the answer is:
**C. a motor made with 1.2 mm copper wire wrapped 15 times around the iron core.**
1. **Material of Wire Coil:**
- Copper is generally a better conductor than aluminum, which often results in a more efficient electromagnet when using it.
2. **Thickness of Wire:**
- Thicker wire (1.2 mm) has lower resistance, which can allow for more current to flow, leading to a stronger magnetic field. However, it also may limit the number of turns that can be achieved in a given space, as the thicker wire occupies more volume.
- Thinner wire (0.4 mm) can be wrapped more times, increasing the magnetic field strength.
3. **Number of Turns:**
- More turns generally create a stronger electromagnet, influencing the strength of the magnetic field and thus the motor's rotation.
Now, let’s evaluate the options:
A. **0.4 mm aluminum wire wrapped 15 times:**
- A decent number of turns, but aluminum is less effective than copper.
B. **1.2 mm aluminum wire wrapped 5 times:**
- Very few turns, leading to a weaker electromagnet, despite the thicker wire.
C. **1.2 mm copper wire wrapped 15 times:**
- A good combination because copper (better conductor) with a higher number of turns could enhance the magnetic field strength, albeit the thickness might limit the number of turns if the space is limited.
D. **0.4 mm copper wire wrapped 5 times:**
- Thin wire (good conductor) but too few turns results in a weaker electromagnet.
Considering the effectiveness of copper, the number of turns, and the thickness of the wire, option **C (1.2 mm copper wire wrapped 15 times)** would likely yield the fastest rate of rotation.
So, the answer is:
**C. a motor made with 1.2 mm copper wire wrapped 15 times around the iron core.**