Magnetism and Electromagnetism
The magnetic reluctance of a material

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

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

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