Define a solenoid. Compare the magnetic field produced by a solenoid with that of a bar magnet?
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a coil of wire usually in cylindrical form that when carrying a current acts like a magnet so that a movable core is drawn into the coil when a current flows and that is used especially as a switch or control for a mechanical device (such as a valve)
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In solenoid poles can be considered to be lying at the edge. 2) The magnetism retains in the bar magnet naturally but in solenoid the magnetism is there so long current flows through it. 3) Magnetic field of a bar magnet emanates from throughout the body of the magnet, with more intensity at the poles.
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