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

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

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Magnetism and Electromagnetism
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?

Decreases
Remains same
Increases
First increases and then decreases depending on the depth of iron in¬sertion

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