Iron filings show the opposing fields of the same poles of two bar magnets. Note that similar poles repel each other.

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Photo credit: © Marmaduke St. John / Alamy / Afripics
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Keywords: attract, attraction, bar, bar-shaped, field, fields, iron, magnet, magnetic, magnetism, north, opposing, opposites, pattern, patterned, patterns, pole, poles, repel, schematic, science