 Review Electrostatics Point Charges Review

 Equations information units F = k(q1q2 )/r2 vector: magnitude, direction, components (resultant)+ forces represent repulsive forces between two charges N E = kQ/r2 vector: magnitude, direction, components (resultant)+ fields represent fields around positive charges N/C V/m where k = 9 x 109 N m2/C2 Coulomb's constant N m2/C2 F = qE vector: magnitude, direction, components (resultant) + forces represents forces whose direction in the same direction as the field line N Vabs = kQ/r scalar: magnitude only + equipotential surfaces surround positive charges J/C EPE = qΔVabs scalar: magnitude only + EPE signifies that the charge has gained electric potential energy J EPEsys = Σk (qiqj / rij) scalar: magnitude only Remember that this is the SUM OF THE POTENTIAL ENERGY OF EACH PAIR of charges J Wdone by external agent = qΔV scalar: magnitude only Remember that the absolute potential at infinity is defined to be zero. J Wdone by field = -ΔEPE scalar: magnitude only Remember that + charges move to points of lower electric potential when moved along electric field lines, therefore they lose EPE. Consequently, when the field does positive work on a charge, (W = Fs cos θ where θ = 0º) the charge loses EPE and gains KE J previous material:    kinematics equations       (accelerated motion)    R = vHt    net F = ma    W = Fs cos θ    KE = ½ mv2    conservation of energy Remember to use H | V charts when analyzing 2-dimensional motion Remember your graph shapes for s vs t and v vs tRemember that projectiles have a parabolic trajectory when they experience accelerated motion in one dimension and constant velocity in another

General Information

charging methods:(basic electrostatics)
by conduction: temporary vs residual charges
charging by induction: temporary vs residual charges
electrification by friction
positively charged: loss of electrons (|e| = 1.6 x 10-19 C)
inverse square relationships (Coulmb's force and E fields for point charges)
inverse relationships (voltage for point charges)
charges flow from one location to another because of a difference in potential
charge configurations comparing net E and net V at a common point
radial electric fields (point charges)
direction of field lines: positive charge, negative charge, similar charges, unlike charges
uniform electric fields (parallel plates)
battery notation: long line positive, short line negative
field strength: density of field lines or closeness of equipotential surfaces
conductor vs insulator
Faraday's Ice Pail Experiment
conducting shells 