Fundamentals of Electromagnetics with Engineering Applications
1st Edition
ISBN: 9780470105757
Author: Stuart M. Wentworth
Publisher: Wiley, John & Sons, Incorporated
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If a trolley has a 120VDC power supply intended to power auxiliary components such as lights, buzzers, and speakers, how would the speakers connect to that power system? I understand that speakers typically operate on AC, so what is the most efficient way to connect them to the 120VDC setup? Additionally, could you provide an estimate of the power output for the speakers?
Choose the appropriate answer
1) Maximum dimension of antenna is 0.5m and operating frequency is 9 GHz, thus the radius of
reactive near field region is
0.562m
1.265m
2.526m
3.265m
2) If distance between transmitter and receiver is 2km and the signal carrier frequency is
300kHz
Rapidly time-varying fields DC field Quasi-static field None
3) The polarization mismatch factor for horizontal polarization wave incident on +z axis is
is if the antenna polarization is circular
0.5
зав
0.707
1
4) Ez 0 and Hz #0 (HE modes): This is the case when neither E nor H field is transverse to the
direction of wave propagation. They are sometimes referred to as
TEM
hybrid modes
TM
TE
5) The normalized radiation intensity of an antenna is represented by:
U(6)=cos²(0) cos2 (30), w/s Half-power beamwidth HPBW is......
28.75
10
0
14.3
Chapter 4 Solutions
Fundamentals of Electromagnetics with Engineering Applications
Ch. 4 - How long does it take for charge density to drop...Ch. 4 - At a particular point in a slab of silver, a...Ch. 4 - A current density is given by J=e.01taA/m2. Find...Ch. 4 - At t=0s, 60.0C is evenly distributed throughout a...Ch. 4 - A propagating electric field is given by...Ch. 4 - A 10.0-MHz magnetic field travels in a fluid for...Ch. 4 - Modify the simple wave program in MATLAB 4.1 to...Ch. 4 - Modify the traveling wave program in MATLAB 4.2 to...Ch. 4 - Prob. 4.9PCh. 4 - A bar magnet is dropped through a conductive ring....
Ch. 4 - Considering Figure 4.7, suppose the area of a...Ch. 4 - Sometimes a transformer is used as an impedance...Ch. 4 - Prob. 4.13PCh. 4 - The mean length around a nickel core of a...Ch. 4 - A triangular wire loop has its vertices at the...Ch. 4 - Referring to Figure 4.23, suppose a conductive bar...Ch. 4 - Suppose we have a conductive bar moving along a...Ch. 4 - The radius r of a perfectly conducting metal loop...Ch. 4 - Rederive Vemf for the rectangular loop of Figure...Ch. 4 - In Figure 4.16, replace the rectangular loop with...Ch. 4 - Prob. 4.21PCh. 4 - Prob. 4.22PCh. 4 - A Faraday disk generator is similar to the...Ch. 4 - Prob. 4.24PCh. 4 - Prob. 4.25PCh. 4 - Suppose a vector field is given by A=2cosaz Verify...Ch. 4 - A pair of 60cm2 area plates are separated by a...Ch. 4 - Plot the loss tangent of seawater ( =4S/m and r=81...Ch. 4 - A 1.0-m-long coaxial cable of inner conductor...Ch. 4 - Suppose in free space that E(z,t)=5.0e2ztaxV/m. Is...Ch. 4 - An electric field propagating in a lossless...Ch. 4 - A magnetic field propagating in free space is...Ch. 4 - Find the instantaneous expression for E for the...Ch. 4 - Given, at some point distant from a source at the...Ch. 4 - In a lossless, nonmagnetic media, the magnetic...Ch. 4 - Suppose, in a nonmagnetic medium of relative...Ch. 4 - Prob. 4.37PCh. 4 - Prob. 4.38PCh. 4 - Prob. 4.39PCh. 4 - Find E(z,t) in Problem 4.32 using phasors.Ch. 4 - Prob. 4.41PCh. 4 - Find H(y,t) in Problem 4.36 using phasors.Ch. 4 - In MATLAB 4.4, a polar plot of the phasor...
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- Choose the best answer of the following: 1- quasi-static electromagnetic field is the a) low frequency b)high frequency c) time independent d) none of the above 2- Displacement current is taken to be negligible (compared to the conduction current) if a) σ>>wε b)σ << wɛ c) σ =0 d) (a and c) 3- The transmission line act as inductor when it terminated by: a) Open circuit load b) short circuit load c)matched load d)none of the above 4- The scattering aperture equals to the effective aperture when the antenna is: a) Complex conjugate matching b) short circuit c) open circuit d) none of the above 5- The isotropic point source has directivity of: a) Infinity b)1 c) 0 d)1.5arrow_forwardI selected a DC-DC converter capable of delivering 120 VDC from a 600 VDC input. When I reached out to the manufacturer, they asked for the total power consumption the converter would need to handle.To estimate this, I calculated the power requirements for the components that will use the 120 VDC supply: interior lighting, end lights, and buzzers. The breakdown is as follows:- Light Bulbs: 16 bulbs at 10 W each = 160 W- Buzzers: 2 buzzers at 5 W each = 10 W- End Lights: 2 lights at 15 W each = 30 W This results in a total estimated power demand of 200 W.My concern is whether I should request a higher wattage rating for the converter to provide sufficient tolerance and ensure the system operates efficiently without risking an overload. Note: The DC power system is designed specifically for a trolleyarrow_forwardChoose the best answer 1. The minimum value of the directivity of an antenna is.......... a) Unity b) Zero 2. Very low signal strength in antenna. a) Minor lobes b) Null c) Infinite d) None c) Antenna patterns d) Major lobes 3. the maximum directivity of an antenna that normalized far field pattern is given by? 0≤0≤ and 0 ≤≤π/2,3л/2≤ p ≤ 2π E(0, 4) = {(sin 0 ((sin cos² ) 1/2 0 is a) 7.07dB b) 7.7dB elsewhere c) 8.7dB d) 9dB 4. the depth of penetration of 1 MHz wave in sea water which has conductivity mhos/meter and permeability approximately equal to that of free space is a) 25mm b) 25cm c)25m 5. The free space media can be considered as _ a) Lossy media b) lossless media c) good conductor 6. The input impedance is equal to the load impedance when a) l = 2 b)1=22 c)=4 d) 25km d) a and c .... d) a and barrow_forward
- Q.1. choose the appropriate answer 1- When neither E nor H field is transverse to the direction of wave propagation. They are sometimes referred to as ...... a) hybrid mode b) TM mode c) TME modes d) TEM mode 2- If PLF-0 dB means......... a) Power is lost 100% b) Power is lost 0% c) Power is lost 50% d) none of the above 3. The half wave dipole is widely used in more applications compared to other linear antenna lengths, that is because..... a) It has high gain b) its easy matching to coaxial 75 Ohm cable c) low loss d) it has small size 4- The mode distribution for the end view waveguide shown below is a) TM12 b) TM21 c) TE20 end view d) TE02 5. When circular right hand polarized wave incident upon a horizontally polarized wave the PLF is a) 0 b)1 c)0.5 d)0.707arrow_forwarda- Single phase transmission line as in the figure below with the radius of the conductor is 0.5 cm, find the inductance of the total system. 4m 4m ao A B ob od 3m 6marrow_forwardPlease don't use ai to answer I will report you answerarrow_forward
- A 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a load consisting of 8 A at p.f. 0-7 lagging for R-phase, 10 A at p.f. 0-8 leading for Y phase and 12 A at unity p.f. for B phase. The resistance of each line conductor is 0.4 2. The reactance of neutral is 0.2 2. Calculate the neutral current, the supply voltage for R phase and draw the phasor diagram. The phase sequence is RYB. IN ER VR Refarrow_forwardA 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a load consisting of 50 A at p.f. 0-866 lagging for R-phase, 30 A at p.f. 0-866 leading for Y phase and 30 A at unity pf. for B phase. The resistance of each line conductor is 0-2 Q. The area of X-section of neutral is half of any line conductor: Calculate the supply end voltage for R phase. The phase sequence is RYB.arrow_forward- A 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a load consisting of 8 A at p.f. 0.7 lagging for R-phase, 10 A at p.f. 0-8 leading for Y phase and 12 A at unity p.f. for B phase. The resistance of each line conductor is 0.4 2. The reactance of neutral is 0.2 2. Calculate the neutral current, the supply voltage for R phase and draw the phasor diagram. The phase sequence is RYB.arrow_forward
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