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Assume you have a solenoid with a diameter of 4.0 cm and 2900 turns per meter, with an impedance of 0.70. An iron core consisting of a bundle of wires is placed in the core. The core has an effective susceptibility of 10 (rather than 1000, for this is based on experimental results). An aluminum ring of a mass of 23 grams (1.4 cm length and inside diameter of 5.7cm) and thickness of 0.33 cm is placed around the protruding core. It operates at 120 V(rms), 60 Hz household ac.
If all of the flux from the solenoid passes through the ring, calculate that flux as a function of time. Find the induced emf from the changing flux.
Calculate the resistance of the ring, using a value of 3.3 x 10^(-8) ohm/m for the resistivity of the aluminum, and from it, find the current in the ring.
Design a multi-function unit with 4 functions chosen using select inputs s1s0. The unit has two 2-bit inputs (A = a1,a0 and B = b1,b0) and 4-bit output (z3,z2,z1,z0). The unit performs A+B (s1s0 = 00), AB (s1s0 = 01), A2+B (s1s0 = 10)
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 temperature
Two hanging balls, each with a mass of 10g, have equal charges. One ball is hung by an insulated thread. Another ball held by an insulated rod.
In a unity feedback system, the open-loop transfer function is of the form G_ol(s)=k/(1+s/Omega_p) Calculate the bandwidth of the closed-loop transfer function. How does the bandwidth depend on k and Omega_p
A 65volt neon lamp is connected across a 8h coil with aresistance of 275. When the coil's field collapses, a 6k resisteris inserted into the circuit in series with the coil. The source is 25 volts D.C.
By how much does the transmit power of a cellular telephone have to be increased if its range is to be increased by 10 times?
Polonium (Po) is the only material which forms a simple cubic crystal (i.e., it is not FCC or BCC) structure with atoms at the corner positions. It is a metal (but it is radioactive so it has very few engineering applications!). Its atomic number ..
A sample of non-ideal gas is made to undergo an expansion process during which its pressure and volume are related as shown in the table below. The energy of the gas at the start and finish of the process is measured and found to be 5 and 3.2 Btu
Within a region with volume 2.1 m^3, J=xhat*3.2*x A/m^2. What is the rate of change of total charge within the volume (in C/s)
A 1000KVA transformer is at full load with a 0.5 lagging powerfactor. If the line voltage is 500 volts at 60Hz. Find the New Volt-Ampere quanties needed to improve the power factor to 0.95 by adding capacitors in parrallel with the transformer.
a) what is the frequency f, of the ac circuit signal b) what is the period, T, of the ac circuit signal what is the angular velocity/frequency (omega), of the ac signal if v(t) = 24 cos (2pie 500t).
Design a circuit using JK flip-flops that takes in a binary stream B0B1B2B3 and outputs 1 at a time t if the stream recieved thusfar (i.e. BoB1..Bt-1Bt), when read as an unsigned binary number, is divisible by 3.
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