Solenoids

Solenoids

A solenoid consists of a wire coiled into numerous loops.
- The magnetic fields from each loop on the coil combine to form a field similar in shape to a bar magnet outside the coils and uniform inside them.
- The strength of this field can be increased by increasing the current or using more loops on the coil.
An electromagnet is a solenoid with an iron core within the coil.
- The iron core further increases the strength of the magnetic field.
- Electromagnets are useful as their strong magnetic field can be switched on or off very quickly.

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