Magnetism and Electromagnetism
The force between two long parallel conductors is inversely proportional to

Product of current in two conductors
Radius of conductor
Current in one conductor
Distance between the conductors

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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?

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

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