Magnetic Materials
Maharashtra Board · Class 12 · Physics
Complete topic list for Magnetic Materials in Maharashtra Board Class 12 Physics. Key concepts, sub-topics, and what to focus on for board exams.
Topics in Magnetic Materials
Magnetic Dipole in Uniform Magnetic Field
- When a magnetic dipole is placed in uniform magnetic field, it experiences a torque τ = m⃗ × B⃗
- Torque magnitude: τ = mB sin θ, where θ is angle between dipole moment and field
- Magnetic potential energy: U = -mB cos θ
Origin of Magnetism in Atoms
- Magnetism originates from moving electrons in atoms
- Orbital motion of electrons creates orbital magnetic moment: m_orb = (e/2m_e)L
- Electron spin contributes spin magnetic moment
Magnetization and Magnetic Intensity
- Magnetization M = net magnetic moment per unit volume
- Magnetic intensity H = magnetic field independent of material properties
- Relationship: B = μ₀(H + M)
Classification of Magnetic Materials
- DIAMAGNETIC: χ < 0, repelled by magnets, all electrons paired
- Examples: Cu, Au, Bi, Pb, water, most organic compounds
- Move from strong to weak field regions
Key Concepts
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