Magnetism and Electromagnetism
The magnetic reluctance of a material

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

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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
Decreases
Increases

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