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Point charge in infinite closed channel. Figure 5.43 shows a hollow cavity in a conducting medium. 'The cavity is infinite in the dimension perpendicular to the plane shown.
(a) Show the location of the image charges necessary to calculate the electric field intensity inside the cavity.
(b) Use the nearest four images and the charge q to calculate an approximate value at the center of the box, in the plane shown. Place a system of coordinates so that the lower left comer of the cavity is at (0, 0).
If an excess of holes is introduced into the center describe in words (and what a sketch would look like) of the minority carrier distribution after a time roughly about equal to the minority carrier lifetime
a)Describe the difference between a relay logic system and a PLC control system. Are there any advantages of PLC control system over relay system. Explain the advantages in details with one example.
The amplitudes of two signals X and Y have joint pdf: fXY (x,y) = e^(-x/2)*y*e^(-y^2) for x>0 , y>0. (a) Find the joint CDF (b) Find P [sqrt(x) > y] (c) Find the marginal PDFs (d) Determine if X and Y are independent.
What are the two possible LO frequencies and the corresponding image frequencies?
Design a 4-element broadside array with equal side lobe level of -20 dB relative to the peak value , take the inter-element spacing d=λ/2 , find the resulting beamwidth to null.
A n-type Si wafer is doped with Nd=1e15/cm^3, find the level of acceptor doping we need to convert the wafer from n-type to p-type, with a target hole density p=5e15/cm^3. also ni = 1e10/cm^3
1. draw a pair of concentric circles. the radius of a smaller circle has to be 40% as large as the radius of the other circle. you decide to make the radius of the smaller circle 5". what would be the circumference of the larger circle approximat..
a block and tackle system with nine supporting strands is used to lift a metal lathe in a manufacturing facility.
Define a Transistor. Why transistor is considered as current control device? Explain.
Assume that a receiver has a first amplifier stage with a 5K input resistance, a power gain of 300, an input audio signal of 20 uV, and an operating temperature of 27'C. When the amplifier is operating with a bandwidth first of 10 MHz
A current source of value 2cos(2t) A is used to power a string of 2W lightbulbs. If you wanted to replace this current source with a DC one, but have the same power drop, what DC current should you apply (one decimal place needed)
Suppose that a 40 MVAR capacitor bank is added to Bus 3 of the power system in Problem 11-5. What happens to the bus voltages in this power system? What happens to the apparent powers of the transmission lines?
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