Question

what is sollanoid?how does it behave when current passes​

Answer 1

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Answer: -   A cylindrical coil of wire acting as a magnet when carrying electric current.A current carrying solenoid induces a magnetic field around it.A solenoid has a large number of close, insulated circular turns. The magnet at the centre of current carrying circular wire is along the axis; so when current is passed in a solenoid, the magnetic fields due to all circular turns are added and hence the field line becomes just as for a bar magnet. Solenoids are most commonly used as electromagnets.

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Answer 2

Answer:

a solenoid is a coil of many turns wrapped closely in the shape of a cylinder.

when current is passed through it, it becomes an electromagnet and behaves like a bar magnet