Magnetism and Electromagnetism
For a given wirewound core, an increase in current through the coil

causes no change in flux density
reverses the flux lines
decreases the flux density
increases the flux density

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Magnetism and Electromagnetism
The left hand rule correlates to

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

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