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Lecture16 Sample Problem2 Solution
HRW 3120
An oscillating LC circuit has a current amplitude of 7.50 mA, a potential
amplitude of 250 mV, and a capacitance of 220 nF. What are (a) the period of oscillation,
(b) the maximum energy stored in the capacitor, (c) the maximum energy stored in the
inductor, (d) the maximum rate at which the current changes, and (e) the maximum rate
at which the inductor gains energy?
Solution:
20. (a)
From
V = IX
C
we find
ω
=
I/CV
.
The period is then
T
= 2
π
/
ω
= 2
π
CV/I
= 46.1
μ
s.
(b) The maximum energy stored in the capacitor is
27
2
9
11
(2.20 10
F)(0.250 V)
6.88 10 J
22
E
UC
V
−−
==
×
=
×
.
(c) The maximum energy stored in the inductor is also
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 Spring '08
 Kim
 Capacitance, Current, Energy

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