Magnetism
Maharashtra Board · Class 11 · Physics
Quick revision notes for Magnetism — Maharashtra Board Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Magnetic Field and Field Lines
- Magnetic field lines form closed loops, unlike electric field lines which start from positive and end at negative charges
- Direction of magnetic field B at any point is given by tangent to field line at that point
- Density of field lines represents strength of magnetic field - more lines per unit area means stronger field
Bar Magnet as Magnetic Dipole
- Bar magnet has two poles: North (+qₘ) and South (-qₘ) with equal and opposite pole strengths
- Magnetic dipole moment: m = qₘ × 2l (vector from S to N pole)
- Axis: Line joining north and south poles
Magnetic Field Due to Bar Magnet
- Field calculations use electrostatic analogy with μ₀/4π replacing 1/4πε₀
- Axial field (along axis): Bₐ = (μ₀/4π) × (2m/r³) for r >> l
- Equatorial field (perpendicular to axis): Bₑq = -(μ₀/4π) × (m/r³) for r >> l
Gauss's Law for Magnetism
- Net magnetic flux through any closed surface is always zero: ∮B·dS = 0
- This law reflects the fact that magnetic monopoles do not exist
- Every magnetic field line entering a closed surface must exit it
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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