Physics II equations
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dissipating capacitorĀ at t=0 and beyond
current
change Vc
RC
Q
 I= E/R````A=V/ohms
 Q=(E)(Cap)``````C=VF
 change Vc=(changeVc)initial(e^t/RC)
 I=Iinitial(e^t/RC)
 RC=decay=0.0001 seconds

Charging capacitor V & I
 I=Iint(e^t/RC)
 changeVc=E(1e^t/RC)


magnetic field w/straight wire
UoI/2piR

magnetic field loop center
UoI/2R

magnetic field loop radius
UoI/2piB

magnetic field of coil
NUoI/2R

magnetic field solenoid
UoIN/L

magnetic field strength & direction w/different wires @ points
 B=(UoI/2piR) + (UoI/2piR)
 wire 1 + wire 2
 signs indicate direction

magnitude & direction of angled wire in magnetic field
 ILBsin@=N
 sign indicates direction


electric potential difference btwn ends w/electric field
V/m*m=Vdiff


Resistor addition for parallel
(1/ohms+1/ohms....)^1

resistor addition for series
ohms1+ohms2.....

Capacitance addition for parallel
C1+C2....

Capacitance addition for series
(1/C1+1/C2...)^1

Reducing and expanding resistors
 1. start from outside
 2. expand closest resistors
 3. subtract inside series currents for outside parallel resistor currents
 series=same volts
 parallel=same current


Charge difference over time equation(q)
q=change(t)(I)

kirchoff's junctions
 1. add incoming
 2. subtract known outgoing=other sides outgoing
 3. subtract outgoing from incoming for sideways current

electrical potential equation
 change of q * change of V= J
 C*V

Resistance equation with material list
pL/A

Resistance equation with V & I
V/A=ohms


current equation with resistor
I=change of V/R