Which of these is true about a bar magnet?
it's poles attract or repel other magnets because of their net electric charge.
it's magnetic north pole tends to point south.
it's poles can't be separated into two isolated poles.
it cannot attract iron objects unless they are permanent magnets.

When we say bar magnet, this is a kind of magnet that is rectangular in shape and possesses magnetic properties. Based on the statements above, the one that is true regarding a bar magnet is that, its poles cannot be separated into two isolated poles. The answer would be the third option. Hope this helps.