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# Phy 131

### For final

Question | Answer |
---|---|

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 the time average radiation energy? | 1/2*EoErad,max^2 |

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 |

How is intensity related to Urad? | I=Urad/C |

What is wave length? | =vT |

How is the B radiation related to the E radiation? | Brad=Erad/C |

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 |