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

Polarity of a magnetic pole
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

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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?

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

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Magnetism and Electromagnetism
The left hand rule correlates to

Current, magnetic field and direction of force on a conductor
Current, induced e.m.f. and direction of force on a conductor
Magnetic field, electric field and direction of force on a conductor
Self induction, mutual induction and direction of force on a conductor

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