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(a) Adding dopants to a sample of silicon is found to reduce the Hall coefficient by a factor of 10 and increase the conductivity by a factor of 5. What effect has this dopant addition had on the mean free path?
(b) In a Hall experiment with a transverse magnetic field of 20 tesla, the total electric field is at angle 20o to the current. Assuming the charge carriers to be electrons, what is their collision time?
(c) If you doubled the width of a Hall sample but kept J and B the same, how would that affect the Hall field? the Hall voltage? the net charge density along the edges?
A lossless transmission line of electrical length l = 0.3? is terminated with a complex load impedance . Find the reflection coefficient at the load, the SWR on the line, the reflection coefficient at the input of the line
What is the channel capacity for a channel with a 300 Hz bandwidth and as S/N = 3? 2nd problem: Given a channel with a 50 kHz bandwidth and a S/N = 127, determine:
Assume initially that no inputs have been seen and create a special initial state with output 0 to start the Moore machine. Draw a state graph for a Moore machine (minimum number of states is 6).
A 500V shunt dc motor has a nominal armature current of 40A, and operates at 1200 rpm. if the armature resistance is 0.25 (ohm), calculate The valve of a starting resistor limiting the initial armature current to 60A
Determine the Polar form of the Impedance for the three components when they are Connected in series circuit and when they are connected in a parallel circuit. Determine it the final impedance is inductive or capacitive. Given: VPP = 400V, IRMS = ..
You are lowering two boxes, one on top of the other, down the ramp shown in the figure by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 16cm/s.
An infinitely long line charge (Pl= 21 PI nC/m) lies along the Z-axis. An infinte area sheet charge PS= 3nC/m^2 lies in the X-Z plane at a distance Y =10 m. a) Using Gauss' law find the field E due to the line charge.
A 1 Ghz, 1 V/m uniform plane wave is propagating in a lossy material having parameters of σ= 2 (S/m), εr= 9, and μr = 16. Determine the average power lost in propagating across a 100 cm2 surface perpendicular to it
Suppose you toss coins three times. Let X be the event that first of the three coin tosses results in "heads." Let Y be the event that you observe total of 2 "heads." Are X and Y independent events
Assume that an additional inductance can be inserted in series with the load. also assume that the converter has no freewheeling diodes. Calculate the added inductance that leads to a conduction period of 180 degrees when alpha = 30 degrees.
If we have a 600ohm transmission line terminated with a 1200ohm resistor, how long must the transmission line be if the input impedance is purely real?
A three-bit Johnson counter is clocked with pulses at a 120 MHz rate. What will be the pulse frequency of the output of the last flip-flop in the chain. Ten pulses are applied to a four-bit asynchronous counter. If the counter state was 0000 befor..
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