Draw the magnetic field lines including the directions, due to a long current-carrying solenoid. Write the important features of the magnetic field obtained.
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Solution
A solenoid is a coil of the large number of turns of insulated copper wire wrapped closely in the shape of a cylinder.
The length of the solenoid is much larger than its diameter.
When a current is passed through the coil, it generates a magnetic field both inside and around the solenoid.
The pattern of the magnetic field produced by a solenoid is shown in the fig.
From the figure, it is clear that the direction of current is the same in all the turns, thus the magnetic field produced due to various turns gets added up.
Therefore a strong magnetic field is produced by a solenoid.
As the field lines are parallel and equidistant inside the solenoid, thus a uniform magnetic field is produced inside the solenoid.
The end of the solenoid where current is seen to be flowing anti-clockwise behaves as a north pole and the end where current flow is clockwise acts as a south pole.
