Question

when the magnet turns in the coil of wire, the coil generates a sine wave voltage. when the magnet has rotated once, the voltage has been positive once and negative once. this is one cycle.
the amount of voltage generated depends on:

• the rotation speed of the magnet.
• the strength of the magnet.
• number of turns in the coil.
• the distance between the coil and the magnet.

how can you generate an ac voltage?

• you can generate an ac voltage by using a stronger magnet
• you can generate an ac voltage by increasing the rotation speed.
• you can generate an ac voltage by moving a magnet near a coil of wire.

Explanation:

AC voltage generation relies on electromagnetic induction, where a changing magnetic flux through a coil induces voltage. Moving a magnet near/through a coil creates the necessary changing magnetic field to produce an alternating (positive/negative cycle) voltage. The other options only affect the magnitude/rate of voltage, not the fundamental generation of AC.

Answer:

C. You can generate an AC voltage by moving a magnet near a coil of wire.