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# Phy 131

### For final

What is the definition of Mutual Inductance? M is equal to the flux through 1 due to 2 divided by the current through 2.
What is the unit of inductance? Henery's (H) = Wb/A
How is the flux written in terms of inductance? The inductance of a due to a is the the inductance (L) times the current (I).
How is the flux related to the area? The flux is equal the integral of B*A
How do you calculate the Magnetic field? B=UI/2pi*r
What is the magnetic field of a solenoid? U*n*I
What is Ampere's law? The integral through a closed surface of the dot product of the Magnetic field and the surface is equal to Uo times the current.
How are the current and the charge related? The charge is the derivative of the current.
What is the displacement current? Id is equivalent to Eo times the derivative of the electric flux with respect to time.
What is the electric flux? It is the integral of the dot product of the electric field, E, with dA.
What is Ampere-Maxwell's law? The integral through a closed surface of the dot product of B and ds is equal to Uo times the current plus the displacement current. which equals UoI+UoEo*d(electric flux)/dt
What is Gauss's Law? The closed integral of the dot product of the Electric field, E, and the dA is equal to the charge enclosed divided by Eo
What is Gauss's Law in Magnetism? The integral of the dot product of the magnetic field and dA is zero
What is Faraday's Law? The closed integral of the dot product of the Electric field, E, and ds is equal to the change in magnetic flux with respect to time.
What is the force acting on a particle due to a magnetic field? It is equal to the charge times the Electric plus the charge times the cross product of the velocity and the magnetic field.
What is KLR for a RC circuit? The emf minus the potential drop across the capacitors, q/C, the potential drop across the resistor, IR, equals zero.
What is the maximum current in a RC circuit? The emf divided by the Resistance
What is the maximum charge of an RC circuit? The emf times the Capacitance, EC
What is the time constant for an RC circuit? RC
What is the eq for current in a RC circuit? -(Q/RC)*e^(-t/RC)
What is the potential energy in a capacitor? U(t)= Q(t)/2C
What is the power in a resistor? I^2*R
What is KLR for an LRC circuit? The emf-IR-L*dI/dt
What is the time constant for an LRC circuit? L/R
What is the max current in an LRC circuit? The Emf divided by R
What is the current in an circuit? Imax(1-e^(-t/T))
What is the resonance frequency for an LC circuit? 1/(LC)^.5
What is the charge in an LC circuit? =QmaxCos(wt+p)
What is the Irms? Imax divided by the square root of 2
What is the Vrms? Vmax divided by the square root of 2
How is the Irms related to the Vrms? The Irms=Vrms/R
What is the voltage drop across an inductor? L*dI/dt
What is the inductive resistance? wL
What is the maximum current? Vmax/XL, the inductive resistance
What is the Capacitive reactance? 1/(wC)
What is the Impedance? (R^2+(XL-XC)^2))^1/2
What is the phase angle? Tan^-1(XL-XC/R)
What is the power in an LRC circuit? I(t)*V
What is the power average of the LRC circuit? 1/2*Imax*Vmax*cos(phy)
What is the power average? The current rms squared times R
When is circuit in resonance? When XL=XC
What is the angular frequency when the circuit is in resonance? Wo=1/(LC)^1/2
What is the definition of inductance? It equals the flux due the loop do to the current divided by the current.
What is the time constant in an RC circuit? RC
What is the time constant for an LR circuit? L/R
What is the time constant for an LC circuit? 2pi/w
What are the units of F? Seconds per Ohm
What are the units of Henery? Ohms times seconds
What is KLR? Emf=Q(t)/C=I(t)R+L*dI/dt*I(t)
How is the Impedance related to the Voltage? Z=Vcomb,m/Imax
What is LENZ law? The closed integral of the dot product of the induced electric field and the length equals the derivative of the magnetic flux with respect to time.
What is the potential energy in a capacitor? 1/2*CV^2=1/2*Q^2/C=1/2*Q*V
What is intensity? The change in the energy flux with respect to time/dA
What is the energy of the electric field? 1/2*Eo*E^2(r,t)
What is the energy of the magnetic field? C^2*1/2*B^2(r,t)
How is the change in energy related to power? =Power times the change in time
What is wave length? =vT
What is the work done by the battery? the voltage time the charge
What is the power over a resistor? The current times the voltage across the resistor
What is the def of Intensity? Power/Area
How is intensity related to the Em? =Em^2/2UoC

Voices

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