You can not make such a strong magnet from a 9V battery.You only stand a chance of levitating a small spherical object pliers is right out.If you use AC it must be rectified into DC to keep the fielding the same direction.
http://uzzors2k.4hv.org/index.php?page=magneticlevitationThis site has the actual project.Ok here he is using 12v and he is able to leviatate the pliers.
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