Question
utus builds the simple electric generator pictured below. Turning the crank causes the magnet to spin, which generates an electric current in the wire loop.
How could Brutus decrease the amount of electric current his generator produces?
A.
increase the number of loops in the coil of wire
B.
increase the rate at which the crank is turned
C.
replace the magnet with a stronger magnet
D.
increase the distance between the magnet and the wire loop
How could Brutus decrease the amount of electric current his generator produces?
A.
increase the number of loops in the coil of wire
B.
increase the rate at which the crank is turned
C.
replace the magnet with a stronger magnet
D.
increase the distance between the magnet and the wire loop
Answers
GPT-5 mini
Answer: D.
Increasing the distance between the magnet and the loop reduces the magnetic field through the loop (and the change in flux), so the induced emf and resulting current decrease. Options A–C (more loops, faster turning, stronger magnet) would increase the induced emf and current.
Increasing the distance between the magnet and the loop reduces the magnetic field through the loop (and the change in flux), so the induced emf and resulting current decrease. Options A–C (more loops, faster turning, stronger magnet) would increase the induced emf and current.