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The bar magnet is what is termed a permanent magnet . This means that it is "always on" and can be used to do things like pick up paper clips. The electromagnet is created by winding a coil of wire about a ferromagnetic core and running a direct current through that coil. Only when the current is flowing will the electromagnet be operating. With the current switched off, the magnetic field around the coil of wire disappears, and the power of the electromagnetic disappears as well.

There are some "fine points" associated with a further extension of this post, but the basic answer to the question is as written.
A bar magnet is made from magnet materials and has a magnetic field at all times. An electromagnetic is not naturally magnet and only has a magnetic field when electricity is passed through it.

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Is the magnetic field of an electromagnet different to a bar magnet?

The magnetic domains in a refrigerator magnet are laid down in parallel strips. They are also re-curved back on themselves so that the back side of the magnet has both north and south poles. If you put two refrigerator magnets back-to-back and move them around a little, it won't take long for you to "feel" the strips of magnetism. The common bar magnet have two simple poles at the ends.


Where is the magnetic field the strongest on a bar magnet?

The magnetic field is strongest at the poles of a bar magnet.


Why the bar magnet attracts the paper clip with more force?

A bar magnet attracts a paper clip with more force compared to a refrigerator magnet because the magnetic field of the bar magnet is stronger due to its design and material composition. The shape and alignment of the magnetic domains in a bar magnet allow for a more concentrated and powerful magnetic field, resulting in a stronger pull on the paper clip.


How a solenoid may be used to demagnatise a bar magnet?

To demagnetize a bar magnet using a solenoid, the magnet can be placed inside a solenoid and the current can be gradually decreased to zero. This process disrupts the alignment of magnetic domains within the magnet, leading to demagnetization. The alternating current can also be used for more effective demagnetization.


Why is magnetism induced into an iron bar placed near a magnet?

When an iron bar is placed near a magnet, the magnetic field of the magnet aligns the magnetic domains within the iron bar. This alignment increases the overall magnetic field strength of the iron bar, effectively inducing magnetism in the bar.

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