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52 Cards in this Set

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Coulomb's Law
F = k*q1*q2/r^2
Lines of a positive force ________, and negative force ___________
go outward, go inward
Electric Field
-A vector pointing in the direction of the field
-units of N/C

E = k*q1/r^2
Force on a charge in an electric field:
F = E*q
The potential Energy (U) of a charge in an electric field:
U = E*q*d
Electric Potential Energy
U = k*q1*q2/r
Voltage
-The potential for work by an electric field in moving any charge from one point to another
-Units = J/C

V = Ed
V = k*q1/r
Equipotential Surfaces
-A surface normal to the field that describes a set of points all w/ the same potential
Electric Dipole
Created by two opposite charges w/ equal magnitude
Electric Dipole Moment
A vector whose magnitude is the charge q on one of the charges times the distance d between the charges (points in opposite direction to E field, from neg to positive
A dipole not perfectly aligned w/ an external electric field will have a potential energy of:
U = -pEcos(theta)
The electric field inside a uniformly charged conductor is _________
zero
Current
-Given in amps, or C/s
-Flow in the direction of positive charge
If an object is made from a homogeneous conductor, the resistance of the object when a voltage is applied uniformly to its ends =
R = p*(L/A)

p = resistivity of material
Voltage Formula
V = iR
Voltage is analogous to:
gh
Kirchoff's First Law
The amount of current flowing into any node must be the same amount that flows out
Node
Any intersection of wires
Kirchoff's Second Law
The voltage around any path in a circuit must sum to zero
Battery
Adds energy to a circuit by increasing the voltage from one point to another (rated w/ EMF)
Capacitor
-Temporarily stores energy in a circuit (form of separated charge)
Electric Field between parallel plate capacitors:
E = (1/K)*(Q/A*eo)

eo = permittivity

k = 1/(4*pi*eo)
Capacitance
C = Q/V
Formula for Parallel Plate Capacitor:
C = K*(A*eo/d)
Energy stored in any capacitor:
U = (1/2)*Q*V
Dielectric Constant (K)
Refers to the substance between the plates of a capacitor (must be an insulator)
Resistors in Series
R(eff) = R1 + R2 + ...
Resistors in Parallel
1/R(eff) = 1/R1 + 1/R2 + ...
Electrical Power
P = i^2*R
Power Dissipated
The rate at which heat is dissipated in a resistor
Max Current in AC circuit
i(max) = sqrt(2*i(rms))
rms
root mean square. square root of the average of the squares.
Capacitance
C = Q/V
Formula for Parallel Plate Capacitor:
C = K*(A*eo/d)
The lines of force in a magnetic field point from the ______ to the ________
north to the south
Energy stored in any capacitor:
U = (1/2)*Q*V
What creates a magnetic field?
A changing electric field (i.e. from current)
Dielectric Constant (K)
Refers to the substance between the plates of a capacitor (must be an insulator)
Magnetic Field for a long, straight wire:
B = (uo*i)/(2*pi*r)
Resistors in Series
R(eff) = R1 + R2 + ...
The force on a charge moving w/ velocity through a magnetic field:
F = qvBsin(theta)
Resistors in Parallel
1/R(eff) = 1/R1 + 1/R2 + ...
Electrical Power
P = i^2*R
Power Dissipated
The rate at which heat is dissipated in a resistor
Max Current in AC circuit
i(max) = sqrt(2*i(rms))
rms
root mean square. square root of the average of the squares.
The lines of force in a magnetic field point from the ______ to the ________
north to the south
What creates a magnetic field?
A changing electric field (i.e. from current)
Magnetic Field for a long, straight wire:
B = (uo*i)/(2*pi*r)
The force on a charge moving w/ velocity through a magnetic field:
F = qvBsin(theta)
T or F: The force due to a magnetic field does work
False. It always acts the centripetal force and can be set equal to mv^2/r
The force on a current carrying wire placed in a magnetic field:
F = ilBsin(theta)