Q)What is solenoid ?compare the magnetic field lines around a bar magnet and solenoid
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A solenoid is a cylindrical coil of wire whose diameter is small compared to its length. The poles of the bar magnet do not lie exactly on the end of the magnet but is somewhat inside. ... 2) The magnetism retains in the bar magnet naturally but in solenoid the magnetism is there so long current flows through it.
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