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a) Two charges, Q1 and Q2 are separated by distance r. State Coulomb's law and write down the force each charge. Explain the condition for a repulsive force and for an attractive force.
b) What is the magnitude and direction of the force between two charges of -10µC and + 40 µC set 100 mm apart? Comment on your answer.
Sketch the E-field and equipotentials associated with this charge system.
c) Charges of Q1 = -10 pC and Q2 = -20 pC are placed 200 mm apart.
At what point the force on a test charge of 1 C be zero?
1 pC = 10-12C. The constant = 9 x 109 m/F, where ε 0 is the permittivity of free space. ε0= 8.85 x 10-12 C2 /N.m2
A 10 GHz radio link is established between two antennas separated by 40 Km , find the necessary height of the antennas , assume equal antenna heights and standard atmospheric conditions.
An altimeter can measure 0-100m; using a signal conditioner, this high position is distributed over a voltage range of 0-5V. If an ADC covering the same voltage range outputs 1000 0000, what is the distance measured
a series-tuned resonant circuit operates at a resonant frequency of 1 mhz and contains a 0.1 microfarad capacitor and
Determine (a) the input to the detector, (b) the optimum threshold (to be compared with the detector input) that minimizes the average probability of error, and (c) the average probability of error.
What happens when you have a non-zener and zener diode in series opposing each other eg non-zener is forward bias and the zener is reverse bias assuming both are ideal (infinite slopes when they are operating).
The network is used for voice communications. Is it possible for one mobile unit to connect to another mobile unit directly? What advantage is there in connecting through the hub?
Consider a 32-bit RC adder unit in which internal carry signals aregenerated using CMOS technology with as few transistors aspossible. Assume that each sum bit is connected to the S input ofthe corresponding gated SR latch.
Find the poles and zeros of H(s) and plot them in the s-plane. Find then the corresponding impulse response h(t). Determine if the impulse response of this system is absolutely integrable so that the system is BIBO stable.
A receiver with a synchronous detector receives a barely intelligible message since the (s/n)d =4 db . it has been determined that the transmitter has ST= 100 W , μ = 0.9 and SX=0.5. What is the minimum value of ST if envelope detection were used.
A) the required step-up voltage ratio for satisfactory performance. B) the voltage ratio of a standard buck-boost transformer that most closely meets the requirements of the load. C) the voltage at the load with the buck-boost transformer installed.
a. Sketch the spectrum of the sampled signal up to 20 KHz. b. Sketch the recovered analog signal if an ideal (brick wall) low pass filter with a cutoff frequency of 4 KHz is used to filter the sampled signal in order to recover the orig..
Assume that a voice channel occupies a bandwidth of 4 khz , now we need to multiplex 10 digitized voice channel (assuming 8 bit per sample) using synchronous TDM. if the interleaved unit is 1 byte . 1 extra bit is added per fram for synchronizatio..
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