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A pair of opposite poles attracting, the magnetic force shown by iron filings.

Attractive poles

A pair of opposite poles attracting, the magnetic force shown by iron filings.

The outline of a bar magnet, and the influence of its poles on a surface covered with iron filings.

Magnetic polse

The outline of a bar magnet, and the influence of its poles on a surface covered with iron filings.

A pair of similar magnetic poles repelling, the magnetic forces shown by iron filings.

Repelling poles

A pair of similar magnetic poles repelling, the magnetic forces shown by iron filings.