الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Direct Current Circuits
8.22) Consider a series RC circuit for
which R=1MΩ, C=5µF, and
ξ=30V. Find (a) the time constant
of the circuit and (b) the maximum
charge on the capacitor after the
switch is closed. (c) If the switch
in the RC circuit is closed at t=0.
Find the current in the resistor R at
a time 10s after the switch is
closed.
8.23) At t=0, an unchanged capacitor
of capacitance C is connected
through a resistance R to a battery
of constant emf (Figure 8.38). (a)
How long does it take for the
capacitor to reach one half of its
final charge? (b) How long does it
take for the capacitor to become
fully charged?
emf
Close at t =0
R
Figure 8.38
8.24) A 4MΩ resistor and a 3µF
capacitor are connected in series
with a 12V power supply. (a) What
is the time constant for the circuit?
(b) Express the current in the
circuit and the charge on the
capacitor as a function of time.
C
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