ECE470
EXAM #2 SOLUTIONS
SPRING 2012
Instructions:
1. Closed-book, closed-notes, open-mind exam.
2. Work each problem on the exam booklet in the space provided.
3. Write neatly and clearly for partial credit. Cross out any material you do not want graded.
ECE470
EXAM #2 SOLUTIONS
SPRING 2011
Instructions:
1. Closed-book, closed-notes, open-mind exam.
2. Work each problem on the exam booklet in the space provided.
3. Write neatly and clearly for partial credit. Cross out any material you do not want graded.
ECE470
EXAM #1 SOLUTIONS
SPRING 2012
Instructions:
1. Closed-book, closed-notes, open-mind exam.
2. Work each problem on the exam booklet in the space provided.
3. Write neatly and clearly for partial credit. Cross out any material you do not want graded.
ECE470
EXAM #1 SOLUTIONS
SPRING 2011
Instructions:
1. Closed-book, closed-notes, open-mind exam.
2. Work each problem on the exam booklet in the space provided.
3. Write neatly and clearly for partial credit. Cross out any material you do not want graded.
ECE470
HOMEWORK #7 SOLUTIONS
SPRING 2013
Problem 7.1
30 o
Ns
sa
saxis
H2
g
Ns
H1
sa
(a) Ns is = H1 g H2 g
(
)
(
)
5RL
7RL
0 = o H 1
+ o H2
6
6
7Ns is
= H1 =
12g
5Ns is
= H2 =
12g
(1)
= 5H1 + 7H2 = 0
(3)
(4)
Hs
7Ns is
12g
0
H1
H1
/2
3/2
2
5Ns is
12g
H2
1
ECE470
HOMEWORK #6 SOLUTIONS
SPRING 2013
Problem 6.1 (Problem 3.20 p. 166)
(
(a) q =
Wm =
Wm =
(b) Fe =
Fext =
)
o A
v = C (x)v
x
1
q2
xq 2
Wm (q, x) =
qv =
=
2
2C (x)
2o A
1
1
o Av 2
Wm (v, x) =
qv =
C (x)v 2 =
2
2
2x
2
o Av
Wm
=
Fe (v, x) =
x
2x2
2
o AV
ECE470
HOMEWORK #3 SOLUTIONS
SPRING 2013
Problem 3.1 (Problem 1.14 p. 47)
(t) = N B (t)Ac = N Ac Bmax sin t = Li(t) = LImax sin t
d
2Vrms cos t
v ( t) =
= N Ac Bmax cos t = Vmax cos t =
dt
N Ac Bmax
2f N Ac Bmax
(a) Vrms =
2f N Ac Bmax 4.44f N Ac Bmax
=
=
ECE470
EXAM #2 SOLUTIONS
SPRING 2013
Instructions:
1. Closed-book, closed-notes, open-mind exam.
2. Work each problem on the exam booklet in the space provided.
3. Write neatly and clearly for partial credit. Cross out any material you do not want graded.
ECE470
EXAM I SOLUTIONS
SPRING 2013
Instructions:
1. Closed-book, closed-notes, open-mind exam.
2. Work each problem on the exam booklet in the space provided.
3. Write neatly and clearly for partial credit. Cross out any material you do not want graded.