Compare the magnetic field around a bar :agent with that produced by a current in a wire coil
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Answer:Even though the magnetic field lines of a solenoid are same as in a bar magnet but in a solenoid field density can be varied by changing no of turns and current density but it can't be done with a bar magnet. Also swaping of poles can be done on solenoid by changing the direction of current but can't be done via a bar magnet. Thats all I know about it.
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