Magnetism and Electromagnetism
A permeable substance is one

Through which the magnetic lines of force can pass very easily
Which is a bad conductor
Which is a strong magnet
Which is a good conductor

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Magnetism and Electromagnetism
When an iron piece is placed in a magnetic field

the magnetic lines of force will bend away from their usual paths in order to go away from the piece
the magnetic field will not be affected
the magnetic lines of force will bend away from their usual paths in order to pass through the piece
the iron piece will break

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