Magnetism and Electromagnetism
A permeable substance is one

Which is a strong magnet
Through which the magnetic lines of force can pass very easily
Which is a bad conductor
Which is a good conductor

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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
Magnetic field, electric field and direction of force on a conductor
Current, magnetic field and direction of force on a conductor

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Magnetism and Electromagnetism
The magnetic reluctance of a material

Any of the listed here
Increases with increasing cross-sec-tional area of material
Decreases with increasing cross sectional area of material
Does not vary with increasing cross-sectional area of material

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