Question

theresa has a magnet and two coils of tightly bound copper wire. how could theresa cause an electric current to flow through one of the copper wires?
a. disconnect the coils and place them side by side.
b. carefully touch the magnet to one of the coils.
c. move the magnet up and down near one of the coils.
d. remove a length of wire from one of the coils.

Explanation:

Step1: Recall electromagnetic induction

Electromagnetic induction occurs when there is a change in magnetic - flux through a conductor, which induces an electric current.

Step2: Analyze each option

• Option A: Disconnecting the coils and placing them side - by - side does not change the magnetic flux through the wires, so no current is induced.
• Option B: Touching the magnet to one of the coils does not necessarily cause a changing magnetic flux through the wire.
• Option C: Moving the magnet up and down near one of the coils changes the magnetic flux through the coil, which according to Faraday's law of electromagnetic induction, will induce an electric current in the copper wire.
• Option D: Removing a length of wire from one of the coils does not change the magnetic flux through the remaining wire and will not induce a current.

Answer:

C. Move the magnet up and down near one of the coils.