Magnetism and Electromagnetism
Strength of an electromagnet can be increased by

Increasing current supply
Increasing the cross-sectional area
Increasing the number of turns
All of the listed here

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Magnetism and Electromagnetism
The left hand rule correlates to

Self induction, mutual induction and direction of force on a conductor
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

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