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Protect a tractor's engine: Ceramic magnets placed in the oil pan will attract steel bits that get into the oil from grinding pistons.

locate metal studs in a wall.

Collect nails from a porch repair job that have fallen in the grass.

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 Locate metal studs in a wall.
Separate iron fillings
 Magnet is used to make magnetic compass which is used to find geographical direction.
They are used in TV screens, computer screens, telephones and in tape recorders.
To construct the electrical motors and the generators 
They are used in the refrigerators to keep the door close
Magnets are also used in cranes
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