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Type: Posts; User: dzafar

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    Closed: 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...
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    Closed: 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...
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    [SOLVED]Closed: Re: 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...
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    [SOLVED]Closed: Re: 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...
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    [SOLVED]Closed: 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)...
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    Closed: Re: Wein Bridge Oscillators - Diode Stabilization

    Ohh!! So you mean, when the amplitude of Vo < 0.6 both diodes are OFF?
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    Closed: 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...
  8. Closed: 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...
  9. [SOLVED]Closed: Specify component values for a given gain at a given frequency

    Hello there,

    Attached below is the question I am trying to solve.

    147789

    (a) H(s) = 2sRC -- Is this correct? Does this mean the zero is at the origin? Is the '2' considered gain?
    (b) I have...
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    Closed: 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...
  11. [SOLVED]Closed: Re: 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
  12. [SOLVED]Closed: Half Wave Rectifier when input voltage is negative

    Hello,

    I am new to half-wave rectifiers. Below is a screenshot from my book.

    147272

    Can someone please explain why VOL is 2V greater than VEE?


    Thanks!
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    [SOLVED]Closed: 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...
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    [SOLVED]Closed: 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...
  15. Closed: Re: 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
  16. Closed: Rate of Return Analysis For Engineering Economics

    Hi there,

    I am confused about rate of return analysis and cash flow diagrams.
    144350
    Any help would be appreciated.

    Thanks!
  17. Closed: Calculating Effective Annual Interest Rate from Nominal Interest Ratte

    Hi,

    I am taking an engineering economics course. The questions says:

    Suppose I have an effective interest rate – 10% per month,
    compounded monthly, say – and I want to transform it
    to an...
  18. Closed: Parameterization when converting from cartesian, cylindrical or spherical

    Hello there,

    I am very very confused when it comes to 'parameterizing'. I do understand the physics part of the problems but getting started on my own is nearly impossible. I am attaching some...
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    Closed: Re: Curent Density inside perfect conductors

    So you mean in the case I provided, J will have a random value? I am just concerned about this specific case when J = ∞.0!

    Thanks
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    Closed: Curent Density inside perfect conductors

    Hi there,

    I understand that conductivity σ, inside a perfect conductor approaches ∞. Also, E-field, inside as well as on the surface of PEC is 0.

    Then according to Ohm's Law: J = σE what should...
  21. Closed: MATLAB 2D Graph of Total Charge vs. Voltage

    Hello,

    I am new to MATLAB. I am trying to plot a 2D graph showing total charge (in pC) vs. Voltage (in V) ranging from 1 to 10V. Below is my attempt which gives an empty window.


    q_tot =...
  22. Closed: Re: Conversion from Cartesian to Cylindrical Coordinate System

    Dear FootTea,

    Thank you for your reply. I understand that because x, y, z are not constants we can not just use them directly. However, I am still having a hard time in understanding the...
  23. Closed: Conversion from Cartesian to Cylindrical Coordinate System

    Hello there,

    I was solving problem 1.14 in Schaum's Outlines Electromagnetics (2nd Edition).

    The problem states to convert a vector A from Cartesian to Cylindrical coordinates. I am attaching...
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    Closed: Re: Critical path of combinational circuit

    @TrickyDicky,

    In the image I attached last time, the path delay is 5ns (say each gate has a delay of 1 ns and and all inputs are sent at time 0). What I am confused about is that the 5ns delay can...
  25. [SOLVED]Closed: Processes and concurrent signal assignments

    Hello there,

    I have a question regarding ARCHITECTURES in VHDL.

    1. Can processes be used along with concurrent signal assignments under the same architecture?
    I think yes, please let me know...
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