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Formula Sheets / Physics

Chapter 22

Magnetic Properties of Matter

Revise with flashcards Download this chapter (PDF) All Physics formulas (PDF)

Bar magnet and Earth's magnetism Magnetic materials

Bar magnet and Earth's magnetism

$B_{axial} = \frac{μ _{0}}{4 π} \frac{2 M}{r ^{3}},$ $B_{equatorial} = \frac{μ _{0}}{4 π} \frac{M}{r ^{3}}$
Earth
$B_{H} = B cos δ,$ $B_{V} = B sin δ,$ $tan δ = \frac{B _{V}}{B _{H}}$
Oscillation magnetometer
$T = 2 π \frac{I}{M B _{H}}$

Magnetic materials

$B = μ_{0} (H + M),$ $χ = \frac{M}{H},$ $μ_{r} = 1 + χ$
Curie's law
$χ \propto \frac{1}{T}$ (paramagnets) $;$ $χ < 0$ (ferromagnets above $T_{c})$
Classification
dia: $χ < 0$ (small) $;$ para: $χ > 0$ (small) $;$ ferro: $χ ≫ 1$

Magnetic Effects of Current Electromagnetic Induction