Three spherical surface charges σ1, σ2 and σ3 are arranged concentrically around the origin of a Cartesian coordinate system with the radii r1, r2 and r3.
It applies σ1=(-2Q)/(4πr1^2), σ2=(+2Q)/(4πr2^2) and σ3=(-2Q)/(4πr3^2), where Q >0 describes an initially unknown amount of charge. Furthermore, the following applies in the entire room: ε=ε0

A point charge with the charge +Q is located at a point with the distance R to the origin. R > r3 applies.
Determine the force F, which acts on the point charge due to the electric field, according to magnitude and direction.

A radar noncoherently integrates 18 pulses, each of uniform amplitude(the nonfluctuating case). The IF bandwidth is 100kHz.
a) If the average time between false alarms is 20 min, what must be the signal to noise ratio per pulse (S/N)n in order to achieve a probability od detection of 0.80?
b) what is the corresponding value of (S/N)1?

c) what would (S/N)1 be if the target cross section fluctuated according to a Swerling Case 1 model?

A source provides 250 Vrms to three loads.

Z1: P1 = 45 kW and Q1 = +63 kVAR

Z2: pf2 = 0.15 lagging and I2 = 100 A rms

Z3: S3= 15∠50º kVA

Determine the total complex power, average power, and reactive power delivered by the

source to the loads.

Design the load to minimize.

the source current magnitude. What is the impedance and the component value of this

load (assume operating frequency of 60Hz)? The source voltage and total average power

delivered by the source may not change.

Capacitive Reactance,Xc = 1/2πfc

Inductive Reactance,XL = 2πfL

Why there is no reactance in DC? Give answer in sentences.

What is Generic Array Logic (GLA) and Complex Programmable Logic Device (CPLD)?

1. A cellular system is allocated enough bandwidth for 200 channels. If the system has a re-use factor of 7 (each cell surrounded by six others with different channels), how many channels are allowed per cell? What if the re-use factor is 4? What if the re-use factor is 12?
2. If a 10km x 10km area is to be covered by hexagonal cells with a diameter of 1km, how many cells are needed (don't worry about overlaps on the edges of the square area)? Note: diameter is defined from corner to corner, and is twice the edge length. See wikipedia for area formulas.

Find the autocorrelation sequence for discrete signal c[n]=[=0.8,1.6,0,2.4,-4]. 0 is the origin. Graph each step and the sequence. Write the sequence also.

a) Design a16-bit MIPS Processor in a simplest form in Verilog code with testbench. Please mention the comments where applicable.

b) mention the steps how your design works.

List the Electric equipment used in Testing and Maintenance of Transformers. Discuss each equipment.

i am working on a project..
i would love to implement ENERGY METERING WITH IT SO AS TO BE ABLE TO CALCULATE THE BILLS AT THE END OF A CERTAIN PERIOD..
how could this be done...BULBS,FANS,SOCKETS are the appliances involved...
how can i get the energy used by all this appliances.

i need very DETAILED TECHNICAL EXPLANATION.

A Y- connected, 460- V, 1710- rpm, 60- Hz, 4- pole squirrel cage induction motor has a rotor current at starting 6 times the rotor current at full load. Calculate:

a. The starting torque as percent of full load torque.
b. The slip and speed at which the motor develops maximum torque.
c. The maximum torque developed b the motor as percent of its full load value.

Consider a BJT transistor acting as a switch. How to determine the design resistances if we want to transition between cut off and saturation region to active region?

Seven Segment display is applicable for alphanumeric display both . Suppose you are appointed as an engineer in company, which deals in same area (Seven Segment display unit) As per customer demand, you need to design a basic logic gate circuit diagram (Combinational circuit), which having output 1 (HIGH) when a 4-bit BCD code translated to a number that uses the upper ngt segment of a single seven segment display unit

Write instruction(s) in C to get bits 4 and 7 of Port-C, then compute the “XOR (exclusive OR)” of these two bits and write the result of the “XOR operation” to bit 4 of Port-D.