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DEFINE A SOLENOID WITH THE HELP OF A SUITABLE DIAGRAM.SHOW THE PATTERN OF MAGNETIC FIELD LINES AROUND A CURRENT CARRYING SOLENOID.STATE THE REGION WHERE FIELD IS UNIFORM.
A long cylindrical coil of insulated copper wire of large number of circular turns is called a solenoid.
When an electric current is passed through a solenoid,it produces a magnetic field around it.Its magnetic field pattern is shown in the figure below :

When a current is passed through the solenoid,the current in each circular loop has the same direction,their magnetic effects get added up producing a strong magnetic field.Inside the solenoid,the magnetic field is almost uniform and parallel to the axis of the solenoid.


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