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Physics 1302, Fall 2007, Prof. J. Miller:
Sample Problems #2a
1. In an
RL
series circuit connected to a dc source and a switch, the inductor gets 50% of its
maximum current 2.2 s after the switch is closed at time
t
= 0 s.
What is the time constant of
this circuit?
2.
A constant magnetic field of 2.0 T is applied to a rectangular loop of area 4.0
x
10
2
m
2
. If the area
of this loop changes from its original value to a new value of 2.0
x
10
2
m
2
in 2.0 s, what is the
emf induced in the loop?
3.
A coil with a selfinductance of 4.0 H is connected to a dc source through a switch.
As soon as
the switch is closed at
t
= 0 s, the rate of change of current is 2.0 A/s.
What is the emf induced
in the coil at
t
= 0 s?
4. A series
RLC
circuit has a 100
Ω
resistor, 6.0mH inductor, and a 1.0
μ
F connected to a 120V
rms ac source at
f
= 60 Hz.
What is the power dissipated by the circuit?
5.
At what frequency
f
will a 30mH inductor have an inductive reactance of 1.0 k
Ω
?
6.
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 Fall '07
 Miller
 Physics, Current

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