Magnetism and Electromagnetism
When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon

Pole strength of the magnet
Number of turns of the coil
Resistance of the coil
Motion of the magnet

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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
Decreases
Increases
Remains same

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