Physics 21
Fall 2007
Solution to HW18
YF 3027 (Modified)
An inductor with an inductance of 2.80 H
and a resistance 7.50
Ω
is connected to the terminals of a battery
with emf of 6.20 V and negligible internal resistance. (A) What is
the power input to the inductor from the battery as a function of
time
t
in seconds if the circuit is completed at
t
= 0? (B) What is
the rate of dissipation of energy in the resistance of the inductor
as a function of time
t
in seconds? (C) What is the rate at which
the energy of the magnetic field in the inductor increases as a
function of time
t
in seconds?
3028
A 21.0
μ
F capacitor is charged by a 135.0 V power supply,
then disconnected from the power and connected in series with a
0.270 mH inductor. (A) Calculate the oscillation frequency of the
circuit. (B) Calculate the energy stored in the capacitor at time
t
=
0 (the moment of connection with the inductor). (C) Calculate the
energy stored in the inductor at
t
= 1.30 ms.
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 Spring '08
 Hickman
 Charge, Current, Magnetic Field, power supply, LRC, oscillation frequency, parallelplate airfilled capacitor

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