Скачать или смотреть Dielectrics & Polarization | Class 12 Physics Electrostatics | Ch 2 | JEE | NEET | Boards | CBSE

In this class, we build crystal-clear intuition on dielectrics and polarization — the backbone for capacitance and many direct Board/JEE/NEET questions. Starting from conductors vs insulators, we classify polar vs non-polar dielectrics, understand molecular dipoles, see how an external electric field induces alignment, define polarization P, and derive must-know relations like P = χe ε₀ E, K(=εr) = E_applied / E_net, σ′ = σ(1 − 1/K), electrostatic shielding, and dielectric breakdown/strength.

What you’ll learn (quick bullets):
Insulators = Dielectrics; why this matters for Electrostatics & Capacitance
Polar vs Non-polar molecules; dipole moment and symmetry intuition (HCl, O₂, CO₂, CH₄)
Polarization as induced net dipole moment per unit volume; units & physical meaning
Competing effects: thermal agitation vs external field
Electrical susceptibility (χe) and linear isotropic dielectric model
Dielectric constant (K = εr) as field dilution factor; vacuum K=1, conductor K → ∞ (electrostatic shielding)
Induced surface charge: σ′ = σ(1 − 1/K) and charge form q′ = q(1 − 1/K)
Dielectric breakdown & dielectric strength (why insulators can start conducting)
Worked configuration: stacked regions (vacuum/dielectric/conductor), E(x) & V(x) graph shapes
Exam-oriented remarks, common traps, and formula recap

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Exam relevance:
CBSE/NCERT Class 12: Electrostatics & Capacitance core theory with formula derivations
JEE Main/Adv.: Conceptual + formula-based MCQs, field inside dielectrics, induced charge, εr use-cases
NEET: Theory, unit/dimension, definitions (P, χe, εr), qualitative reasoning
IGCSE/IB (foundation): Dipoles, polarization, field in media, breakdown

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