Question

what what is solenoid​

Answer 1

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solenoid :- A solenoid is a type of electromagnet, the purpose of which is to generate a controlled magnetic field through a coil wound into a tightly packed helix. The term was invented in 1823 by André-Marie Ampère to designate a helical coil.

Answer 2

A coil of many circular turns of insulated copper wire wraped closely in the shape of cyclinder is called as solenoid