Question
A group of students conducted an activity for science class. They used a galvanometer, which is an instrument that can detect an electric current. They followed these steps:
Obtain a 100 foot long electrical extension cord.
Connect each end of the extension cord to the galvanometer.
Using duct tape, secure part of the extension cord to the ground as shown below.
Swing the top part of the extension cord as if a person were to enter to jump rope.
Have a student observe the galvanometer while the cord is rotating.
Students observed that the needle of the galvanometer moves. What does this demonstrate?
A.
Moving an electrical conductor through Earth's magnetic field induces an electric current.
B.
Moving an electrical conducting wire through a magnetic field changes the wire's conductivity.
C.
Moving an electrical conducting wire close to the ground changes Earth's magnetic field.
D.
Moving an electrical conductor next to an electric current produces a magnetic field.
Obtain a 100 foot long electrical extension cord.
Connect each end of the extension cord to the galvanometer.
Using duct tape, secure part of the extension cord to the ground as shown below.
Swing the top part of the extension cord as if a person were to enter to jump rope.
Have a student observe the galvanometer while the cord is rotating.
Students observed that the needle of the galvanometer moves. What does this demonstrate?
A.
Moving an electrical conductor through Earth's magnetic field induces an electric current.
B.
Moving an electrical conducting wire through a magnetic field changes the wire's conductivity.
C.
Moving an electrical conducting wire close to the ground changes Earth's magnetic field.
D.
Moving an electrical conductor next to an electric current produces a magnetic field.
Answers
GPT-4o mini
The observed movement of the galvanometer's needle while the extension cord is swung demonstrates:
**A. Moving an electrical conductor through Earth's magnetic field induces an electric current.**
This is based on Faraday's law of electromagnetic induction, which states that a change in the magnetic environment of a conductor can induce an electromotive force (and thus, an electric current) in the conductor. In this case, the swinging extension cord acts as an electrical conductor moving through the Earth's magnetic field, which induces a current detectable by the galvanometer.
**A. Moving an electrical conductor through Earth's magnetic field induces an electric current.**
This is based on Faraday's law of electromagnetic induction, which states that a change in the magnetic environment of a conductor can induce an electromotive force (and thus, an electric current) in the conductor. In this case, the swinging extension cord acts as an electrical conductor moving through the Earth's magnetic field, which induces a current detectable by the galvanometer.