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Key Equations
Coulomb’s law F= k q 1 q 2 r 2 F= k q 1 q 2 r 2
electric field E → = F → q test E → = F → q test
magnitude of electric field of point charge E= k| Q | r 2 E= k| Q | r 2
change in electric potential energy for a charge that moves in a constant electric field Δ U E =−qE( x f − x i ) Δ U E =−qE( x f − x i )
electric potential energy of a charge a distance r from a point charge or sphere of uniform charge U E = kQq r U E = kQq r
definition of electric potential V= U E q V= U E q
change in electric potential for a charge that moves in a constant electric field ΔV=−E( x f − x i ) ΔV=−E( x f − x i )
electric potential of a charge a distance r from a point charge or sphere of uniform charge V= kQ r V= kQ r
capacitance C= Q V C= Q V
energy stored in a capacitor U E = 1 2 C V 2 U E = 1 2 C V 2
capacitance of a parallel-plate capacitor C=κ ε 0 A d C=κ ε 0 A d