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Flux density

Magnetic flux lines

Coulomb's Law

Transient induced magnetism

Dip

Variation

Angle a freely suspended magnet makes with the horizontal

The number of magnetic flux lines per square metre cross-section

Inverse square law to calculate attractive and repulsive forces between magnetic poles

A soft iron bar that has been magnetised and its poles are not permanent

Lines of magnetic force from a magnet

Angle between true north and magnetic meridian at that place