Soft-iron bars called magnetic keepers are placed across stored magnets’ poles m

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1. Soft-iron bars called magnetic keepers are placed across stored magnets’ poles mainly to protect them from?

Earth’s own magnetic field

The effects of other nearby magnets

Gradual self-demagnetisation over time

Demagnetisation caused specifically by heating

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Keepers complete a low-resistance magnetic circuit between a stored magnet’s poles, which helps the magnet retain its strength rather than gradually weakening on its own.