Question
Alice builds an electric motor by positioning an electromagnet between the poles of a permanent magnet. When the electromagnet turns, the current through it switches direction because its connections to the voltage source are reversed. The repeated switching of the electromagnet's poles causes it to spin. This particular motor is used to turn the wheels of a toy car.
Which of the following actions would increase the amount of force applied to the wheels of the toy car?
A.
decreasing the electric current running through the electromagnet
B.
decreasing the number of loops in the electromagnet's coil
C.
replacing the magnet with a stronger magnet
D.
increasing the distance between the magnet's poles and the electromagnet
Which of the following actions would increase the amount of force applied to the wheels of the toy car?
A.
decreasing the electric current running through the electromagnet
B.
decreasing the number of loops in the electromagnet's coil
C.
replacing the magnet with a stronger magnet
D.
increasing the distance between the magnet's poles and the electromagnet
Answers
GPT-4o mini
To increase the amount of force applied to the wheels of the toy car, the best option from the list provided would be:
**C. replacing the magnet with a stronger magnet.**
Here’s a brief explanation for each option:
- **A. decreasing the electric current running through the electromagnet:** This would decrease the strength of the magnetic field produced by the electromagnet, reducing the force applied.
- **B. decreasing the number of loops in the electromagnet's coil:** Fewer loops in the coil would also decrease the strength of the magnetic field generated by the electromagnet, leading to less force applied.
- **C. replacing the magnet with a stronger magnet:** A stronger permanent magnet would increase the magnetic field strength, which would interact more effectively with the electromagnet's field, thus increasing the force applied to the wheels of the car.
- **D. increasing the distance between the magnet's poles and the electromagnet:** This would weaken the magnetic interaction since magnetic force decreases significantly with distance, thus reducing the force applied.
Overall, replacing the magnet with a stronger one would enhance the motor's effectiveness in applying force to the toy car's wheels.
**C. replacing the magnet with a stronger magnet.**
Here’s a brief explanation for each option:
- **A. decreasing the electric current running through the electromagnet:** This would decrease the strength of the magnetic field produced by the electromagnet, reducing the force applied.
- **B. decreasing the number of loops in the electromagnet's coil:** Fewer loops in the coil would also decrease the strength of the magnetic field generated by the electromagnet, leading to less force applied.
- **C. replacing the magnet with a stronger magnet:** A stronger permanent magnet would increase the magnetic field strength, which would interact more effectively with the electromagnet's field, thus increasing the force applied to the wheels of the car.
- **D. increasing the distance between the magnet's poles and the electromagnet:** This would weaken the magnetic interaction since magnetic force decreases significantly with distance, thus reducing the force applied.
Overall, replacing the magnet with a stronger one would enhance the motor's effectiveness in applying force to the toy car's wheels.