Bar Magnet & Dipole Field
Magnetic moment m = pole-strength × 2ℓ; field lines emerge from N, end at S.
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Class 12 · Notes
Magnetism & Matter— Notes, Formulas & Revision
Complete revision notes and formulas for Magnetism & Matter (Class 12). Curated for JEE, NEET, AP Physics, SAT, and CUET. Tap any topic to open the live simulation and full PYQ set.
Axial vs Equatorial Field
B_axial = (μ₀/4π)(2m/r³), B_equa = (μ₀/4π)(m/r³). Ratio = 2.
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Earth's Magnetic Field
Declination, dip angle I, horizontal component H. tan I = 2 tan λ.
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Magnetization & H, B Relation
M = χH, B = μ₀(H + M), μ_r = 1 + χ. Tune both to see effect.
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Dia / Para / Ferromagnetic
Dipole alignment under H — dia opposite, para weak parallel, ferro strong.
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B-H Hysteresis Loop
Soft iron (thin loop, low loss) vs hard steel (fat loop). Coercivity, retentivity.
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Magnetism & Matter on sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs). Free physics revision for Class 12, JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT Subject Physics, and CUET-UG.