Question

4.2.4 quiz: electromagnetism
question 1 of 10
a circuit is made up of a moving magnet, a wire coil, a battery, and conducting wires. which item is not required for the circuit to produce an electric current?
a. the battery
b. the wire coil
c. the moving magnet
d. the conducting wires

Explanation:

According to Faraday's law of electromagnetic induction, when a magnet moves relative to a wire coil (which is part of a closed circuit made with conducting wires), an electric current is induced. A battery is used to provide a potential difference in a circuit where current is driven by the battery's emf, but in electromagnetic induction (the phenomenon here), the induced current is due to the changing magnetic flux (from the moving magnet) through the coil in a closed - loop (with conducting wires). So the battery is not required.

Answer:

A. The battery