HW 7 Solutions

HW 7 Solutions - Problem
Set
#7:
Solutions


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Unformatted text preview: Problem
Set
#7:
Solutions
 Conceptual
questions:
 1(a)
Xc=1/ωC;
It
is
halved
when
frequency
is
doubled
and
doubled
 when
frequency
is
halved
 1(b)
Yes
during
the
part
of
the
cycle
that
the
current
flows
towards
 the
battery.
See
Fig.
36.23
during
cycles
labeled
as
“energy
from
field
 to
circuit ”.
First
and
third
quarter.
 2.
If
voltage
leads
the
current,
then
current
lags
the
voltage
and
 response
is
inductive‐>
XL>Xc
and ω>ωο 3.
(a)
IXL>IXc‐>
as
above
ω>ωο 3.
(b)
 VRo
black,
VLo
blue,
VCo
green,
Vo
Red
 3.
(c)
Vro
about
twice
as
big
as
Vco‐Vlo

tanθ=1/2 the
voltage
leads
the
current
by
 26
degrees,
 4.

 cos φ = R / Z = 1 / 1 + (ωL − 1 /ωC ) 2 / R 2 Increases
with
increasing
R,
decreases
with
increasing
L
and
C
 € 7.1
(a)
Current
leads
by
45
degrees
 (b)
Current
leads
voltage
circuit
capacitive
(see
Fig.
12.8.1
in
problem
tips
 (c)
No
current/voltage
not
in
phase
 (d)
cos45=1/sqrt(2)=.71

 ...
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This note was uploaded on 12/28/2011 for the course PHYSICS 270 taught by Professor Drake during the Fall '08 term at Maryland.

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