Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
A student has a coil of unknown inductance and resistance. He connects it in series with a 100 ohm resistor, places a voltmeter across the resistor, and connects the whole circuit to a power supply.
The current density inside a long solid cylindrical wire of radius a is in the direction of central axis and varies linearly with the distance from that axis r according to J=J0 r/a.
A long straight wire with the mass per unit length of 50 g/m is suspended by threads. A 10 A current in the wire experiences horizontal magnetic force that deflects it in a way that the threads are
A testing laboratory adjusts the magnetic field until the proton's cyclotron frequency is 10.0 MHz. At this field strength, the Hall voltage on the probe is 0.543 mV when the current through the pro
An electron is shot into one end of the solenoid. As it enters the uniform magnetic field within the solenoid, its speed is 800 m/s and its velocity vector makes an angle of 30 degrees with the cent
The equivalent series impedance of the transformer is (1.0 +j2.5) ohms referred to the high side. The transformer is delivering rated load at 0.8 power factor leading and at rated secondary voltage.
If the signal is connected to the input of an inverting op-amp circuit, what voltage gain is necessary so that the output of the amplifier produces a change of 2 V for every degree change in tempera
The coils on the rotor, 10 turns per coil, are connected in series through the slip rings so that at any instance of time there are 5 coil sides under each pole. What is the dc voltage from a full w
A hypothetical starting motor in an automobile has an armature 20 cm long, diameter 10 cm and has slots 0.5 cm deep filled with windings. The radial field is provided by coils in the stator to obtai
The resistance readings collected after the open and short circuit tests are the resistance reading when the transformer is operating with DC. Supposedly, the resistance collected should be the same
A circuit element is hidden inside a potato sack and draws a current which varies with time t, measured in seconds, i(t) = 0.04 e(-4400 · t) Amps, while the voltage drop across this element i
All the parallel ports do not have bidirectional capability. Earlier parallel ports had only output enabled in data pins since printers only inputs data. But latter, to make parallel port capable of
The output is 1 when the pattern abca has occurred an even number of times in x(0,t). Give a state description of the system. Use a state vector approach and a minimum-number-of-states approach.
The output is 0 if the pattern 0110 has not occurred in x(0,t); it has value 1 if the pattern 0110 has occurred but the pattern 1001 has not; and it has value 2 if both 0110 and 1001 have occurred.
An object in a microwave oven 25 cm in diameter and 4 cm thick is being warmed. Determine how deeply the signal penetrates if the objects εr is 12.5 and σ is 2 S/m at a frequency of 2.
The radial field is provided by the coils in the stator to obtain a flux density of .2 Wb/m^2 so that there is one south and on the opposite side, the north pole. The coils on the rotor, 10 turns pe
Derive a hazard-free realization (and show that it is hazard-free), of the function AC+BCD+A'B'D' using only 2-input NAND gates, assume inputs are available uncomplemented and complemented.
calculate the load voltage in a transformer if supply voltage is 240 Volts. The resistance and inductance refered to the high side are as follows: Req is 29.12 ohms, Xjeq is j12.1 ohms, Rc is 1033 o
(a) Find the Fourier transform X(Ω) of x(t). (b) Is x(t) band limited. If so, find its maximum frequency Ωmax. (c) Suppose that Ts = 2π. How does Ωs relate to the Nyquist frequenc
Typically, a speech signal that can be understood over a telephone shows frequencies from about 100 Hz to about 5 KHz. What would be the sampling frequency fs (samples/sec) that would be used to sam
how could an oscilloscope be used to display current waveforms instead of voltage waveforms. what constraints apply to your current measuring method.
given the equation: τ=(t2-t1)/ln(v1/v2) and need to derive this equation: v(t)=(const)(e-t/τ) in order to do so. How to derive the second equation properly to get the first equation
An induction load consisting of a bank of induction motors consumes 50 kW at a power factor of 0.8 lagging from a 220-V (rms), 60-Hz single phase source. By placing a bank of capacitors in parallel
A pn-junction is uniformly doped and has dopant concentration of NA = 4 x10^16 cm^-3 in the pregion at 300K. At zero bias, 20% of the total space charge region (W) is extended in the pregion. Calcul
A shunt motor rotating at 1500 rpm is fed by a 120V dc source. The line current is 51 A and the shunt-field resistance is 120 ohm. If the armature resistance is 0.1 ohm, calculate armature current a