Problem 6.14 The plates of a parallel-plate capacitor have areas of 10 cm2 each
and are separated by 2 cm. The capacitor is filled with a dielectric material with
= 40 , and the voltage across it is given by V (t) = 30 cos 2 106t (V). Find the
Problem 7.5 A wave radiated by a source in air is incident upon a soil surface,
whereupon a part of the wave is transmitted into the soil medium. If the wavelength
of the wave is 60 cm in air and 20 cm in the soil medium, what is the soils relative
Problem 1.4 A wave traveling along a string is given by
y(x,t) = 2 sin(4 t + 10 x) (cm),
where x is the distance along the string in meters and y is the vertical displacement.
Determine: (a) the direction of wave travel, (b) the reference phase 0 , (c) th
ECE 3106 - Eleetremagnetie Field 1] ~ Midterm I
Name Student ID_ "1 b
Time: 12:20pm 1:10pm Tetal # efPrnhlems: 5
Problem 1 115 Meints:
If I (3 pts) The primary and seeendary eeils In an ideal transfenner "
the amplitude ef input eurrent is 20 A. the ampl
Problem 8.1 A plane wave in air with an electric field amplitude of 20 V/m is
incident normally upon the surface of a lossless, nonmagnetic medium with r = 25.
Determine the following:
(a) The reflection and transmission coefficients.
(b) The standing-wav
ECE 3105 Exam #3, Fall 2014 59 g 9g?" :3
University Number: Onig give the last 4 digits, please print dearly:
Name (rst name oniy, no 135: name), piease print:
Problem 1 115
Problem 2 [25
"PibEEhTBJ/4 ' ' V 73'5 ' * ' * " " ' "
Problem 5 125
Total , / 100
ECE 3105 Exam #2., Fall 2014
University Number: Oniy give the last 4 digits, pEease print clearly:
Name (first name enEy, no last name), piease print:
Problem I [40
Problem 2 125
Probem 3 [29
Problem 4/5 [15
9 Ne questions asked during exam
Problem 6.1 The switch in the bottom loop of Fig. P6.1 is closed at t = 0 and
then opened at a later time t1 . What is the direction of the current I in the top loop
(clockwise or counterclockwise) at each of these two times?
t = t1
ECE 3105 Exam #1, Fall 2014
Name (Last, first name) , piease print:
9 No questions asked during exam
6 Do not start until told u Honor Code
0 Do not leave the classroom 5 minutes before the exam ends The instructor will tell
Problem 7.6 The electric field of a plane wave propagating in a lossless,
nonmagnetic, dielectric material with r = 2.56 is given by
E = y 20cos(6 109t kz)
( V/m )
(a) f, up, , k, and .
(b) The magnetic field H.
( a )=