A current can be produced in a coil of wire _____.
when a core of iron rests in the coil
as a core of iron is being thrust through the coil
when a magnet rests in the coil
as a magnet is being thrust through the coil
when a core of iron rests in the coil
as a core of iron is being thrust through the coil
when a magnet rests in the coil
as a magnet is being thrust through the coil