a horseshoe shape (similarly to an arc spring).

Solenoids provide magnetic focusing of electrons in vacuums, notably in television camera tubes such as vidicons and image orthicons. Electrons take helical paths within the magnetic field. These solenoids, focus coils, surround nearly the whole length of the tube.

Physics

Infinite continuous solenoid

An infinite solenoid has infinite length but finite diameter. "Continuous" means that the solenoid is not formed by discrete

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