any bicycles have generators that have a light that can be powered without a battery. Instead of a battery, a magnet and a coil of wire are used to make an electric current flow. The setup shown below models how a bicycle generator functions to produce light. Currently, no electric current is flowing through the circuit shown.

Question

What needs to happen to cause an electric current to flow through the circuit?
A.
The magnet needs to be in constant motion.
B.
A smaller wire needs to be used.
C.
The magnet's north pole needs to point up.
D.
A bigger light bulb needs to be used.

Answer 1

The correct answer is:

A. The magnet needs to be in constant motion.

For an electric current to be generated in a circuit using a magnet and a coil of wire, the magnet must move relative to the coil. This motion induces an electric current through electromagnetic induction. The other options do not contribute to producing an electric current in this context.