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Recent content by dzafar

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    Coulomb Gauge vs. Lorenz Gauge

    Hi there, I am trying to solve Problem 10.5 from Griffiths Introductionto Electrodynamics. The problem says: Which of the potentials in Ex. 10.1, Prob. 10.3, and Prob. 10.4 are in the Coulomb gauge? Which are in the Lorenz gauge? (Notice that these gauges are not mutually exclusive.) From Ex...
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    What is the meaning of Skin Depth?

    Hello, My book defines skin depth as "a measure of how far the wave penetrates into the conductor". Just to double check if I am on the right track of thought, does this mean that since it is a conductor all charges quickly move to the edges. Hence, the wave (?) will only be able to penetrate...
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    [SOLVED] General Identity of Derivative

    Okay.. so I figured it out. My mistake was that I was taking B directly inside the derivative and making it a B^2. The correct way is to apply the product rule for derivative. For simplicity I am taking two different fields, B1 and B2: ∂(B1.B2)/∂t = B1.∂B2/∂t + B2.∂B1/∂t Since, B1 = B2 = B =>...
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    [SOLVED] General Identity of Derivative

    Okay!! I know what I wrote DOES make sense. B is NOT a variable. It is a VECTOR FIELD!!! Once you understand that it is a vector, then you would see that vector dot the same vector is equal to the MAGNITUDE squared of the vector!! and hence (ii) is correct!
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    [SOLVED] General Identity of Derivative

    Hello, I know this is really stupid BUT my mind is still questioning it. I am taking the dot product of magnetic field, B with its derivative: B.∂B/∂t ................(i) = ∂B2/∂t ........(ii) = 2 B.∂B/∂t ..........(iii) BUT eqn(i) ≠ eqn(iii)!!! What is going on? Am I not thinking correctly...
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    Wein Bridge Oscillators - Diode Stabilization

    Ohh!! So you mean, when the amplitude of Vo < 0.6 both diodes are OFF?
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    Wein Bridge Oscillators - Diode Stabilization

    Hello there, I cam across Wien Bridge Oscillators (attached below) but am having a hard time understanding why both the diodes are OFF at low signals? My understanding says: when signal is low (i.e. negative), D1 will be ON and D2 OFF, and vice versa. Hence, the effective resistance will...
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    Getting nagative width in Chebyshev Transformer

    Hi there! Objective: To design a wideband matching transformer to match a 10 Ω load to a 50 Ω transmission line at a center frequency of 1.0 GHz, matched so that |Γin| < 5%. Calculate the Scaling Constant, A. Calculate all partial reflection coefficients. Calculate the characteristic...
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    [SOLVED] Specify component values for a given gain at a given frequency

    Hello there, Attached below is the question I am trying to solve. (a) H(s) = 2sRC -- Is this correct? Does this mean the zero is at the origin? Is the '2' considered gain? (b) I have no idea how to approach part b.. Help! Same thing for the question below: (a) H(s) = (1/RC)/s -...
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    RFID Antenna and Tags

    Hello there, I am trying to put together an obstacle detection system that detects RFID tags from a minimum distance of 3 m. These tags are to be worn by employees in a warehouse and the reader and antenna are to be mounted on a moving forklift. I have already purchased SparkFun Simultaneous...
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    [SOLVED] Half Wave Rectifier when input voltage is negative

    Suppose I have an LM741 op amp. What should I look in the datasheet to get that information? dzafar
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    [SOLVED] Half Wave Rectifier when input voltage is negative

    Hello, I am new to half-wave rectifiers. Below is a screenshot from my book. Can someone please explain why VOL is 2V greater than VEE? Thanks!
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    [SOLVED] Rectangular waveguide

    Hi, I am new to rectangular waveguides. In one question I am given the source freqency, relative permitivity and permeability of the dielectric material and the width and height of the rectangular waveguide. I am asked to find: 1. All possible modes that could propagate in the waveguide 2...
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    [SOLVED] Transmission Line Theory Understanding

    Hello all, I am new to transmission line theory. I am reading Microwave Engineering by David M. Pozar. He mentions: "The key difference between circuit theory and transmission line theory is the electrical size. Circuit analysis assumes that the physical dimensions of the network are much...
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    Rate of Return Analysis For Engineering Economics

    Yes and also explain what they did so I can use it as a reference! Isn't that the point of this forum, to help? Thanks

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