Question

what is solenoid ? and diagram ​

Answer 1

Answer:

A solenoid is a coil of wire in a corkscrew shape wrapped around a piston, often made of iron. As in all electromagnets, a magnetic field is created when an electric current passes through the wire.

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Answer 2

The solenoid is a long cylindrical coil of wire consisting of a large number of turns bound together very tightly. The length of the coil should be longer than its diameter. Magnetic field around a current carrying solenoid is shown in figure. These appear to be similar to that of a bar magnet.