Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

equal to unity
slightly more than unity
slightly less than unity
equal to that ferromagnetic mate rials

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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?

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

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