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1. What is the Laplacian of a scalar? What is its expansion in Cartesian coordinates?
2. State Poisson's equation.
3. Outline the solution of Poisson's equation for the potential in a region of known charge density varying in one dimension.
4. State Laplace's equation. In what regions is it valid?
Discuss the properties and practical applications of the following electrical engineering materials : (a)Carbon and graphite (b) copper
A diode is fabricated with Na>>Nd. What value of doping isrequired on the lightly doped side to achieve a reverse-break down of 1000V if the semiconductor material breaks down at a field of300kV/cm
Identical isolated conducting spheres 1 and 2 have equal charges and are separated by a distance that is large compared with their diameters (a).
A new semiconductor has Nc = 1019 /cm3 and Nv=5 x 1018, and Eg = 2eV. If it is doped with 1017 donors (fully ionized), calculate the electron, hole, and intrinsic carrier concentrations at 627K.
We have studied the performance of the Alamouti scheme in a channel with two transmit and one receive antenna. Suppose now we have an additional receive antenna. Derive the ML detector for the symbols based on the received signals at both receive ..
Are all Maxwell's equations in differential form independent? If not, which of them are independent?
a 500-turn toroid of square cross section has an inner radius of 10cm and an outer radius of 15cm. The relative permeability of the core is 1000. For a current of 10A in the coil, calculate(a) the energy density, (b)the stored energy
A 25-kVA load with power factor 0.80 lagging has a group of resistive heating units added at unity power factor. How many kW do these units take, if the new overall power factor is 0.85 lagging
Study code acquisition in frequncy hopping spread spectrum communication systems.Describe and explain why it is necessary. Design and demonstrate a code acqusition method.
Write an equation to help determine P-type body doping concentration Na for a required threshold voltage V (sub TN) for an N-channel Al-Sio(sub 2) -Si MOSFET.
A 75 hp, 60 Hz, 2300 V, 20 A, 2 pole, wye connected, design B induction motor with code K delivers rated horsepower at 3500 r/min. Assume the phase angle of the locked-rotor impedance is 75 degrees.
During the current oscillations, the maximum current in the inductor is 1.60 A.What is the maximum energy E_max stored in the inductor at any time during the current oscillations.
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