The best replacement for bar magnet is electromagnet.

The best alternatives to bar magnet are rated as following:
★★★★★  electromagnet
★★★★  horseshoe magnet
★★  electromagnetic

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Speaking about bar magnet, one probably shouldn't forget about magnetic field lines.

Other search terms related to bar magnet and their ratings are:
★★★★★ magnetic field lines
★★ field lines
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Google Trends

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bar magnet
electromagnet
horseshoe magnet