Why does insulated wire help make a stronger electromagnet?
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electromagnet
Figure 1: Elements of a solenoid
To clarify, an electromagnet is created by wrapping a coil of wire around a core, typically made of soft iron. Using insulated wire is essential because it prevents the electric current from short-circuiting by jumping between adjacent turns of the wire.12
When wire is insulated, the current is forced to follow the entire length of the coiled path rather than taking a "shortcut" through touching metal surfaces. This ensures that the current flows through every turn of the coil, which is necessary to generate a strong, concentrated magnetic field around the core. Without this insulator, the electrical path would be compromised, significantly reducing the magnetic strength of the instrument.21