 # Physics Important Lines.docx - Chapter 23 1. Coulomb’s Law,...

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Chapter 231.Coulomb’s Law, Electric force:¿q1¿q2¿r2,ke=14π ε0=8.99×109fe=k¿2.Gravitational force:¿m1¿m2¿r2fg=G¿3.Electric Field:E=feq0=kqr24.Volume charge density:ρ=QV,Units=C¿m35.Surface charge density:σ=QA,Units=C¿m26.Linear charge density:λ=Ql,Units=C/m7.fe=qE=ma,a=qEmChapter 241.Gauss’s Law, Electric flux:ϕE=EA ,with angle:ϕE=EAcosθ2.ϕE=qε03.E=2kλr4.E=σ2ε0
Chapter 251.Positive plate is always taken as higher potential and negative plate is taken as lowerpotential.2.Electric field lines are from positive plate to negative plate.3.Potential Energy:P.E = mgh4.If the height of a charge placed between positive and negative plates is increasing theP.E increases and if height is decreasing the potential energy decreases.5.Change in potential energy:∆U=−Eq0d6.Potential difference, Electric Potential, potential voltage:V=kqr∆V=∆Uq0,∆V=−Ed∆V=Ed(Is final form, for positive charge put – withformula and for negative charge put +, relation between electric potential and electricfield)7.1V = 1J/C8.1N/C = 1V/m9.

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Magnetic Force, Magnetic Field
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