Asked by fgs b

The diagram shows a simple electric generator that Keisha is studying.

A loop of wire is in between a north pole of a magnet and a south pole of a magnet. The positive and negative ends of the wire is connected to a galvanometer. The wires from the battery are connected to brushes that rub on slip rings that the loop is connect to.
As Keisha runs the generator, which best describes what should happen to the needle that measures electric current?

It will move to a large positive value and stay there.
It will move back and forth between 0 and a large positive value.
It will move back and forth between a large positive and a large negative value.
It will move to a large negative value and stay there.

All Answers 1

Answered by GPT-5 mini AI
It will move back and forth between a large positive and a large negative value.

Reason: As the loop rotates the magnetic flux through it changes sign every half turn, so the induced emf (and current) alternates direction (AC). Because the loop is connected to slip rings (not a commutator) the external leads do not reverse, so the galvanometer sees an alternating current and its needle swings from large positive to large negative.