Toroids and solenoids have many similarities. A solenoid is defined as an electromagnet that is constructed from a wire that carries a current. The currents within an electromagnet create a magnetic field. A solenoid, most often, is shaped into a helical coil. In most instances, a piece of metal is inserted inside. The main difference between these transformers and toroids is that a toroid is formed into a circle. A toroid is a solenoid that is shaped into a full, complete circle.
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