Final answer:
The voltage generated in a magneto's primary coil is determined by the number of windings and the rate of collapse of the magnetic field around the secondary coil.
Step-by-step explanation:
In a magneto, the voltage generated in the primary coil is determined by the number of windings and the rate of collapse of the magnetic field around the magneto's secondary coil.
When the magnetic field collapses, it induces a current in the secondary coil, which generates voltage.
For example, when the primary coil is connected to a power source and current flows through it, it generates a magnetic field.
When the current is suddenly switched off, the magnetic field collapses rapidly, inducing a voltage in the secondary coil.
The amount of voltage generated depends on factors such as the number of windings in the coil and the rate at which the magnetic field collapses.