Draw the pattern of magnetic field lines produced around a current carrying solenoid. Compare this field due to that of a bar magnet. ​

Dear Student,
      
Magnetic field produced by a solenoid is similar to the magnetic field produced by a bar magnet. When an electric current is passed through it a magnetic field is produced within the solenoid. If the solenoid is long and the successive insulated copper turns have no gaps, then the magnetic field within the solenoid is uniform, with practically no magnetic field outside it. The reason is that the solenoid may be supposed to form of a large number of circular current elements. The magnetic field due to a circular loop is along its axis and the current in upper and lower straight parts of solenoid are equal and opposite. Due to this the magnetic field in a direction perpendicular to the axis of solenoid is zero and so the resultant magnetic field is along the axis of the solenoid. One end of the current carrying solenoid acts like a north-pole and the other end a south pole. The magnetic field lines outside the solenoid starts at North Pole and end at South Pole where as inside the solenoid they move from South Pole to North Pole so the field lines make closed loop.
Regards.

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from north to south the magnetic fieldlines will  move along with the flow of current
 
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