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

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Magnetism and Electromagnetism
The magnetic reluctance of a material

Any of the listed here
Increases with increasing cross-sec-tional area of material
Does not vary with increasing cross-sectional area of material
Decreases with increasing cross sectional area of material

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