# Shared Flashcard Set

## Details

Physics Final Equations
N/A
36
Physics
05/13/2011

Term
 Electric Potential (V)
Definition
 V =  U /q
Term
 Change in Potential
Definition
 change U = q * change in V
Term
 Electric Potential due to several Point Charges
Definition
 U_E=1/(4π∈_o ) ((q_1 q_2)/r_1,2 +(q_1 q_3)/r_1,3 +(q_3 q_2)/r_3,2 )
Term
 Change in Voltage across a uniform field
Definition
 V= -Ed
Term
 Charge on a Capacitor
Definition
 Q= C VC is capacitance for the capacitor and Q is the charge on each plate
Term
 Ohms Law
Definition
 V=IR
Term
 Kirchoffs Rules
Definition
 Junction ∑▒〖Current in-∑▒〖Current Out 〗=0〗Loop ∑▒〖ΔV=0〗
Term
 Power
Definition
 P = IV
Term
 Charging an RC circuit
Definition
 V_c (t)= E(1-e^(-t/τ) ) τ is the time constant RC
Term
 Discharging an RC circuit
Definition
 V_c (t)= E(e^(-t/τ) )
Term
 Lorentz Force
Definition
 (F_B ) ⃗=qv ⃗×B ⃗ Lorentz force (magnetic force on a point charge)
Term
 Circular Force of Magentic Field
Definition
 F=(mv^2)/r=qvB For circular trajectory around B lines
Term
 Magnetic Force on a Straight Wire segment
Definition
 F ⃑=IL ⃗×B ⃗ Magnetic Force on a straight line segment of current carrying wire
Term
 Motional EMF
Definition
 E =vBL
Term
 Magnetic Flux
Definition
 ϕ=BA cos⁡Θtheta is the angle between B and the normal to the surface
Term
Definition
 E= - N*Δϕ/ΔtN = loopsphi = change in fluxt = time intervalE= EMF
Term
 Transformer
Definition
 I_2/I_1=E_1/E_2=N_1/N_2
Term
 Inductance
Definition
 A current in coil 1 causes a magnetic flux in current 2N_1 ϕ_12=MI_2
Term
 LR Circuits
Definition
 I(t)=I_f (1-e^(-t/τ) )τ is time constantI_f is the final current
Term
 Time Constants for RC and LR circuits
Definition
 RC --> RCLR --> L/R
Term
 Discharging LR Ciruit
Definition
 I(t) = I_o*e^-t/τ
Term
 Root Mean Squared
Definition
 1/√2 * amplitude
Term
 Power and RMS
Definition
 You get average power as it current is calculated from the rms Voltage. therefore its the rms I you use.
Term
 Reactance of a Capacitor
Definition
 V_c =I*Xc = I/(2 π f * C)
Term
 Inductors and Reactance
Definition
 V_L = IX_L = I (2πf L)
Term
 Phasor Diagrams and the RLC Circuit
Definition
 the amplitude = (V_R^2+(V_L-V_C)^2)1/2in AC E = IZZ is impedanceZ = (R^2+(X_L-X_C)^2)1/2
Term
 Index of Refraction
Definition
 n=C/vC speed of lightv speed in other mediumn is always bigger than 1
Term
 Intensity of Light
Definition
 I = < P >/A average power A is area
Term
 Malus's Law
Definition
 I = I_o cos ^2 Θtheta is angle between axis of transmission and the incident of polarizations
Term
 Angles and Laws of Reflection
Definition
 Angle of incidence is equal to angle of Reflection
Term
 Snell's Law
Definition
 n_i sin Θ_i = n_t sin Θ_t
Term
 Thermal Expansion
Definition
 linear --> change in length/original length = alpha * change in temparea--> change in area/original are = 2* alpha * change in temp
Term
 Ideal Gase Law
Definition
 PV = nRT
Term
 Work and Gas
Definition
 Work done on the system is equal to negative work done by the gas
Term
 Entropy
Definition
 change in entropy = change in heat/ temp
Term
 Internal Energy
Definition
 change in internal energy = mols * C * change in tempC is D.O.F. C = 3/2 R for mono-atomic gasses C = 5/2 for diatomic gasses
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