Fundamentals of Electromagnetics with Engineering Applications
1st Edition
ISBN: 9780470105757
Author: Stuart M. Wentworth
Publisher: Wiley, John & Sons, Incorporated
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Chapter 7, Problem 7.31P
Assume that the coupling efficiency from a typical LED to a graded-index multimode fiber can be approximated as
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Problem 2
In a P-type semiconductor. the Fermi level is 0.3 cV above the
valance band at a room temperature of 30O °K. Determine the new position of the
Fermi level for termperatures of (a) 350 K and (b) 400 K.
The Fermi level in a P-type material is given by
A silicon diode is in connected to a DC voltage source with Forward biased, the net currentflowing through the diode is (25mA) where the applied voltage across the terminals of thediode is (820mV). Determine diode temperature, if Is "dark saturation current", the diodeleakage current density in the absence of light is 3.4 × 10−10 A
Consider the circuit with three diodes and a AC input, as shown below:
D2
R1
D1
D3
R2
Assume that the input AC voltage is Ttsin(100TTT). You may consider the diodes to be ideal.
mean voltage generated across resistor R2 is (assuming current direction to be from AC so
into R1, through diode network, and through R2 from top to bottom):
O a. 0.5V
Ob. -0.5V
O c. 1V
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Chapter 7 Solutions
Fundamentals of Electromagnetics with Engineering Applications
Ch. 7 - Find the cutoff frequency for the first eight...Ch. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Calculate uG the wavelength in the guide, and the...Ch. 7 - Consider WR975 filled with polyethylene. Find (a)...Ch. 7 - Plot up and wavelength in the guide as a function...Ch. 7 - WR90 waveguide is to be operated at 16 GHz....Ch. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Suppose a length of WR137 waveguide operated at...
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - Find an expression for the magnetic field of the...Ch. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16PCh. 7 - Compose a program that will plot the left and...Ch. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Prob. 7.21PCh. 7 - Prob. 7.22PCh. 7 - Prob. 7.23PCh. 7 - Prob. 7.24PCh. 7 - Prob. 7.25PCh. 7 - Prob. 7.26PCh. 7 - Suppose nf=1.475 and nc=1.470. Determine the...Ch. 7 - Prob. 7.28PCh. 7 - Prob. 7.29PCh. 7 - Prob. 7.30PCh. 7 - Assume that the coupling efficiency from a typical...Ch. 7 - Prob. 7.32PCh. 7 - Prob. 7.33P
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- For the diodes used , at what Voltage (VD) does condection stars .arrow_forwardIn the circuit shown in the figure, diode voltages are given as 0.6V and rD = 100 ohms. When point B is open circuit AIf + 5V is applied to the point of application, drawing the shape of the circuit formed and calculating the currents passing through the resistors.calculate.arrow_forwardSuppose we have a 10-V-peak sinusoidal voltage source. Draw the diagram of a circuit that clips off the part of the sinusoid above 5 V and below -4 V. The circuit should be composed of ideal diodes, dc voltage sources, and other components as needed. Be sure to label the terminals across which the clipped output waveform vo(t) appears.arrow_forward
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- Problem 2 In a P-type semiconductor, the Fermi level is 0.3 eV above the valance band at a room temperature of 300 "K. Determine the new position of the Fermi level for temperatures of (a) 350 "K and (b) 400 "K. The Fermi level in a P-type material is given byarrow_forwardA silicon diode has a forward voltage drop of 1.2V for a forward DC current of 100mA. It has a reverse current of 1μA for a reverse voltage of 10V. Calculate the: a. Bulk resistance b. Reverse resistance c. AC resistance at forward DC current of 2.5mAarrow_forwardA room temperature small-signal silicon diode has a measured forward voltage drop of 0.58 V at 1.0 mA of forward current flow. Using the Shockley equation, calculate the estimated new forward current in mA to one decimal place for a measured voltage drop of 0.68 V assuming the diode is at room temperature.arrow_forward
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