Question
generator converts mechanical energy to electrical energy. When a coil placed between two magnets rotates, the magnetic lines of force are disturbed. This induces a current in the coil. The image below shows a generator.
What could be done to make the lamp less bright?
A.
increase the strength of the magnets
B.
turn the coil faster
C.
use a lamp that lights up with a lower current
D.
move the magnets farther from the coil
What could be done to make the lamp less bright?
A.
increase the strength of the magnets
B.
turn the coil faster
C.
use a lamp that lights up with a lower current
D.
move the magnets farther from the coil
Answers
Answered by
GPT-5 mini
D. Move the magnets farther from the coil.
Explanation: Brightness depends on the induced voltage/current. Moving the magnets farther reduces the magnetic field through the coil and so reduces the induced emf and current, making the lamp dimmer. Increasing magnet strength or turning the coil faster would increase the induced emf (brighter), and using a lamp that lights with lower current would make it easier to light (not dimmer).
Explanation: Brightness depends on the induced voltage/current. Moving the magnets farther reduces the magnetic field through the coil and so reduces the induced emf and current, making the lamp dimmer. Increasing magnet strength or turning the coil faster would increase the induced emf (brighter), and using a lamp that lights with lower current would make it easier to light (not dimmer).
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