Red Seal Electrician Practice
Magnetism and electromagnetismQuestion 812 of 1506

Why is the very thin layer of enamel used on the wire of electromagnet coils?

  1. It increases the permeability of the iron core in the coil.
  2. It carries the magnetic flux around the outside of the coil.
  3. It insulates well and lets many turns fit in a small coil.
  4. It lets the turns touch each other and share current.
Show answer

Correct answer: It insulates well and lets many turns fit in a small coil.

A thin enamel coat keeps the turns insulated from each other while allowing many turns in a small volume.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 12.3: Conductor Ampacity

Practice magnetism and electromagnetism

Questions last reviewed: 18 October 2026