Magnetism and Electromagnetism
Fleming's left hand rule is used to find

Direction of force on a current carrying conductor in a magnetic field
Direction of magnetic field due to current carrying conductor
Direction of flux in a solenoid
Polarity of a magnetic pole

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

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