Question

what is solenoid with the help of a daigram show the pattern of magnetic field line in and around a current carrying solenoid state the region where its magnetic field is uniform state how would you determine the north pole of a current carrying solenoid ​

Answer 1

A coil of many turns of insulated copper wire wrapped closely in the shape of a cylinder is called a solenoid. the magnetic field is uniform inside the solenoid.

We can determine the north and south poles of a current carrying solenoid by using a bar magnet. We bring the bar magnet near both the ends of a freely suspended current carrying solenoid. The end of the solenoid which will be repelled by the North Pole of bar magnet will be it's North Pole and the end of the solenoid which will be attracted by the North Pole will be the South Pole of the solenoid.

This is because a solenoid itself behaves like a bar magnet.