Physics II equations

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1. 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
2. Charging capacitor V & I
• I=Iint(e^-t/RC)
• changeVc=E(1-e^-t/RC)
3. propagation
V=m/s
4. magnetic field w/straight wire
UoI/2piR
5. magnetic field loop center
UoI/2R
UoI/2piB
7. magnetic field of coil
NUoI/2R
8. magnetic field solenoid
UoIN/L
9. magnetic field strength & direction w/different wires @ points
• B=(UoI/2piR) + (UoI/2piR)
• wire 1 + wire 2
• signs indicate direction
10. magnitude & direction of angled wire in magnetic field
• ILBsin@=N
11. Torque
IABsin@
12. electric potential difference btwn ends w/electric field
V/m*m=Vdiff
13. Power equation
• IV=P
• AV=W
(1/ohms+1/ohms....)^-1
ohms1+ohms2.....
C1+C2....
(1/C1+1/C2...)^-1
18. 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
19. decay equation
• weird T=RC
• ohms(F)
20. Charge difference over time equation(q)
q=change(t)(I)
21. kirchoff's junctions
• 2. subtract known outgoing=other sides outgoing
• 3. subtract outgoing from incoming for sideways current
22. electrical potential equation
• change of q * change of V= J
• C*V
23. Resistance equation with material list
pL/A
24. Resistance equation with V & I
V/A=ohms