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 Electric field strength
 q: the charge creating the field
 r: distance from the field (point in space)

Electric field strength of a parallel plate capacitor
 E: electric field strength
 ΔV: change in potential of the plates (power source)
 d: distance between the plates

 Potential at a point distance away from a charge
 Scalar quantity (+,,0)
 q: central charge
 r: distance from that charge
epe=Vq (q=other charge)

 Coulomb's law
 Interaction for point electric charges
 q: charges
 r: distance separating them
 Direction determined by hand via attraction/repulsion

 If we place a charge within an electric field
 q: charge
 E: electric field strength
 Direction must be determined by hand via attraction/repulsion

Work is equal to  change in epe or + change in ke

 electric potential energy
 V: electric potential of a space (point distance)
 q: charge

 Work done on a charge in an electric field
 q: charge
 V: potential of the charge

 Kinetic energy (normal)
 m: mass
 v: velocity

Capacitance of a capacitor
 ε_{0}: permativity of free space
 A: area of the plates of a capacitor
 d: distance between the plates

 Ohm's Law
 Potential = current x resistance

Equivalent resistance of resistors IN SERIES

Equivalent resistance of resistors IN PARALLEL

 P: power
 V: potential
 I: current
 R: resistance

 Capacitance of a capacitor
 q: charge of plates
 V: voltage difference between plates

Equivalent capacitor for capacitors IN PARALLEL

Equivalent capacitor for capacitors IN SERIES

 Energy stored in a capacitor
 U: epe
 C: capacitance
 V: voltage (potential)
 q: charge

Power is equal to work over time

Exponential decay of stored charge in a capacitor

Exponential decay of current across a resistor (as resistance builds)

Exponential growth of charge being stored in a capacitor

Exponential decay of current in a capacitor (as charge builds)

 Induced emf from change in magnetic field
 : indicates that the direction opposes change
 N: number of loops
 ΔΦ: change in flux
 Δt: change in time

 Force exerted on a wire from a magnetic field
 F: force
 I: current in wire
 L: length of wire in B field
 B: magnetic field strength
 θ: angle between I and B

 Magnetic Flux
 A: surface area
 B: magnetic field
 θ: angle between magnetic field and **normal to area

 Shell's law
 θ: angle between ray and NORMAL of surface
 n: refractive index

 refractive index
 v: speed of light in substance
 c: speed of light in vaccum
 n: refractive index

 (Electromagnetic wave)
 c: speed of light in vaccum
 f: frequency of wave
 λ: wavelength

 d_{0}: distance between object and mirror
 d_{i}: distance between image and mirror
 f: focal length
 f>0 converging lens, f<0 diverging lens
 di>0 real image, di<0 virtual image

 M:
 h_{i}: image height
 h_{0}: object height
 d_{0}: distance between object and mirror
 d_{i}: distance between image and mirror
 m<0 real, inverted image
 m>0 virtual, upright image

