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Assume that a single high-voltage 60 Hz power line carries a current of 500 Amperes and has its center located 12 meters above the ground.
(a) Model the line as an infinite filament of current under dc conditions. Calculate the magnetic field intensity in amperes/meter at the top of the head of a man who is 2 meters tall. Assume the man is standing on the ground directly underneath the line. Include a figure to express the geometry used to obtain your answer.
(b) What is the magnetic flux density in units of Tesla, corresponding to the intensity in part (a)?
(c) Calculate the wavelength in miles of a 60 Hz signal in free space.
(d) Is the dc assumption used in part (a) reasonable? Explain.
(a) Determine free electron and hole concentration.(b) Calculate the effective density of states at valence band, Nv. Given that ni = 1x1010 cm3 and kT = 0.026.
Design a circuit that takes a sinusoidal input of varying frequency at 1V amplitude and produces an output amplitude of approximately 1V when the frequency is 1 Hz and approximately 0.5V when the frequency is 1,000Hz.
Consider a square house 40 ft on a side, 10 ft high, with a flat roof on top and walls/roof that is 8 inches thick. The thermal conductivity for an un-insulated wall or roof is 1.6 W/Km, while with fiberglass insulation its 0.04 W/Km.
Draw the winding on the stator and the winding on the rotor of a three-phase 6-pole synchronous generator which has salient poles. Assume that the stator winding is concentrated for simplicity. Show the values of the conductor angles on the stator..
Suppose you have a line charge and a point charge in space. A point charge of 16nC is located at Q(2,3,5) in free space, and a unifor line charge of 5nC/m is at the intersection of the planes x=2 and y=4. If the potential at the origin is 100V, fi..
Write a simple shell script called mathmagic that takes two arguments in at call time and returns to the stdout the value of the two items entered, the value of the two items added together, the value of the two items subtracted
Hand calculate the expression for the voltage and current of the capacitor and plot these equations by using MATLAB and calculate the time constants of each circuit and point out this time constants at your voltage graphs.
1. Two resistors R1 = 5.6 kΩ and R2 = 3.3 kΩ are to be connected in series. Calculate the series equivalent resistance Rs. 2. The same two resistors are reconnected in parallel. Calculate the parallel equivalent resistance Rp.
a.) For a given tank circuit resonance frequency, what is the parameter that determines the bandwidth b.) What is the phase angle of a inductive susceptance
In an AC-DC power adapter, one of the following two conversions is used: half-wave recti?er and full-wave recti?er. The half wave recti?er can be described mathematically as a system with input x(t) and output y(t) such that
Time to failure in months, X Fx(x) = (1 - e ^(-x/5))u(x) for plant A Fx(x) = (1 - e ^(-x/2))u(x) for plant B Plant B produces three times as much as plant A. What is the probability that a bulb purchased at random will burn at least
Sketch the theoretical torque vs. speed characteristics for a series, shunt, and compound connected DC motor. Describe what will happen if a series motor is run under no load conditions. describe what will happen if a shunt motor experiences a lo..
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