Class 12 · Chapter

Magnetism & Matter

6 topics · 6 interactive simulations

Magnetic moment m = pole-strength × 2ℓ; field lines emerge from N, end at S.

B_axial = (μ₀/4π)(2m/r³), B_equa = (μ₀/4π)(m/r³). Ratio = 2.

Declination, dip angle I, horizontal component H. tan I = 2 tan λ.

M = χH, B = μ₀(H + M), μ_r = 1 + χ. Tune both to see effect.

Dipole alignment under H — dia opposite, para weak parallel, ferro strong.

Soft iron (thin loop, low loss) vs hard steel (fat loop). Coercivity, retentivity.