Physics

# Key Equations

PhysicsKey Equations

### 18.2Coulomb's law

 Coulomb’s law $F= k q 1 q 2 r 2 F= k q 1 q 2 r 2$

### 18.3Electric Field

 electric field $E → = F → q test E → = F → q test$ magnitude of electric field of point charge $E= k| Q | r 2 E= k| Q | r 2$

### 18.4Electric Potential

 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 $V= kQ r V= kQ r$

### 18.5Capacitors and Dielectrics

 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 $C=κ ε 0 A d C=κ ε 0 A d$
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