Question
Brutus builds the simple electric generator pictured below. An electric current is generated in the wire loop whenever he turns the crank, causing the magnet to spin.
How could Brutus increase the amount of electric current his generator produces?
A.
replace the magnet with a weaker magnet
B.
increase the rate at which he turns the crank
C.
increase the distance between the magnet and the wire loop
D.
replace the wire loop with an unlooped strand of wire
How could Brutus increase the amount of electric current his generator produces?
A.
replace the magnet with a weaker magnet
B.
increase the rate at which he turns the crank
C.
increase the distance between the magnet and the wire loop
D.
replace the wire loop with an unlooped strand of wire
Answers
GPT-4o mini
Brutus can increase the amount of electric current produced by his generator by:
**B. increase the rate at which he turns the crank.**
Increasing the rate at which the crank is turned will cause the magnet to move more quickly relative to the wire loop, which increases the rate of change of the magnetic field through the loop. According to Faraday's law of electromagnetic induction, a greater rate of change in the magnetic field induces a stronger electric current.
The other options would not effectively increase the current:
- **A. replace the magnet with a weaker magnet** would reduce the current.
- **C. increase the distance between the magnet and the wire loop** would weaken the magnetic field experienced by the loop, thus reducing the current.
- **D. replace the wire loop with an unlooped strand of wire** would not generate effective induction as the loop geometry is crucial for maximizing the magnetic field interaction.
Thus, the best choice is B.
**B. increase the rate at which he turns the crank.**
Increasing the rate at which the crank is turned will cause the magnet to move more quickly relative to the wire loop, which increases the rate of change of the magnetic field through the loop. According to Faraday's law of electromagnetic induction, a greater rate of change in the magnetic field induces a stronger electric current.
The other options would not effectively increase the current:
- **A. replace the magnet with a weaker magnet** would reduce the current.
- **C. increase the distance between the magnet and the wire loop** would weaken the magnetic field experienced by the loop, thus reducing the current.
- **D. replace the wire loop with an unlooped strand of wire** would not generate effective induction as the loop geometry is crucial for maximizing the magnetic field interaction.
Thus, the best choice is B.