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

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Magnetism and Electromagnetism
In a simple magnetic field the strength of magnet flux

decreases continuously from initial value to final value
first increases and then decreases till it becomes zero
is constant and has same value in energy part of the magnetic field
increases continuously from initial value to final value

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