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35.
(a) The generator emf is a maximum when sin(
ω
d
t
−
π/
4) = 1 or
ω
d
t
−
π/
4=(
π/
2)
±
2
nπ
[
n
= integer]
.
The Frst time this occurs after
t
=0iswhen
ω
d
t
−
π/
4=
π/
2 (that is,
n
= 0). Therefore,
t
=
3
π
4
ω
d
=
3
π
4(350 rad
/
s)
=6
.
73
×
10
−
3
s
.
(b) The current is a maximum when sin(
ω
d
t
−
3
π/
4) = 1, or
ω
d
t
−
3
π/
4=(
π/
2)
±
2
nπ
[
n
= integer]
.
The Frst time this occurs after
t
=0iswhen
ω
d
t
−
3
π/
4=
π/
2 (as in part (a),
n
= 0). Therefore,
t
=
5
π
4
ω
d
=
5
π
4(350 rad
/
s)
=1
.
12
×
10
−
2
s
.
(c) The current lags the emf by
+
π
2
rad, so the circuit element must be an inductor.
(d) The current amplitude
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics, Current

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