Copper is usually used for the voice coil, however other metallic elements such as aluminium can also be utilised. The voice coil wire can be circular, rectangular or even hexagonal. A range of various voice coil wires are used in order to give different volume coverage, within a magnetic gap. The voice coil is positioned coaxially inside the gap. This gap is in actual fact a small circular hole, within the magnetic structure in order for the voice coil to be able to move back and fourth. This gap creates a powerful magnetic field amid the poles of a permanent magnet, whereby the outside of the gap acts as a singular pole, and the centre post serves as the other. The centre post and the back plate are known as the Yoke.
Question: A pole is situated at the hub of the magnetic field this is also known as the Yoke
Options:
A. true, B. false, C. uncertain
Answer: B